Thought dead, Darth Maul survived his injuries by focusing on his hatred of Obi-Wan Kenobi, the Jedi who cut him in half. His shattered body was dumped amid the refuse of the junk planet Lotho Minor, where the once deadly warrior fell into madness, staying alive on a diet of vermin.
He mortally wounds Jedi Master Qui-Gon Jinn during the Battle of Naboo before being bisected by Qui-Gon's apprentice, Obi-Wan. Fueled by his hatred, Maul survives and is driven insane over a decade of isolation until his brother, Savage Opress, finds him during the Clone Wars.
He was filled with anger when he realized that as a child, the Jedi had not come for him. Maul did not know if they found him unworthy or simply ignored him, and their neglect fueled his rage, counting the days until he could have his revenge.
Maul's skills, on the other hand, became stagnant as he spent the last few decades of his life keeping himself alive and plotting schemes. Given this, it makes sense Obi-Wan quickly defeated Maul in their final duel in Star Wars Rebels.
Like his master, Darth Sidious, better known as Sheev Palpatine, Maul's main weakness was his overconfidence. In Luke Skywalker's confrontation with Palpatine during The Return of the Jedi, he tells the Emperor that his overconfidence is his weakness.
Why Palpatine Admitted that he Deeply Missed Darth Maul - Star Wars Explained
Who is Darth Maul scared of?
Regardless, based on the season 7 of The Clone Wars, and the fact that Darth Maul was aware of Anakin Skywalker's future and his role as the Chosen One, it is very likely that Darth Maul indeed feared Darth Vader to some extent, and preferred to avoid a direct confrontation with him, at least, on his own.
Seeing his Master murdered caused Obi-Wan to press his attack aggressively, catching Darth Maul off guard. When Maul regained his composure he was able to Force-push Obi-Wan into a melting pit, where he held on for dear life. Calming himself, Obi-Wan leaped over Maul and used Qui-Gon's lightsaber to sever Maul in two.
He had killed his master, Qui-Gon Jinn, for which Obi-Wan got his revenge by slicing the Sith in half. But after Maul took yet another person away from him, Obi-Wan absolutely hated Maul. The Jedi Master almost let his rage and anger get the best of him, growing close to the dark side before he rejected it.
During the Invasion of Naboo at the climax of The Phantom Menace, Maul first kills Qui-Gon Jinn, then is defeated when Obi-Wan Kenobi bisects him with a shockingly non-fatal blow.
In the now-abandoned Legends continuity, his birth name appeared to be Maul, with the title of "Darth" simply added to it when he was taken on as an apprentice by Darth Sidious.
Sidious revealed to Maul that he did not intend to kill his former apprentice, as he still had use for Maul; it was Sidious' hope that Maul would lead the Sith to Mother Talzin, Maul's mother and the leader of the Nightsisters, so she could be eliminated as a potential threat to the eventual Sith rule of the galaxy.
Maul most likely knew Sidious' double role as Palpatine and Sidious when he served as Palpatine's apprentice. He definitely knew about Palpatine's goal of creating a galactic empire ruled by the Sith. Maul knows that Sidious is the Emperor.
Maul shows signs of Antisocial Personality Disorder and Narcissistic Personality Disorder that were probably caused by a mix of genetics and circumstances.
Legend had it that Yoda—a Jedi who became Grand Master—was trained by N'Kata Del Gormo. A Force-sensitive Hysalrian, N'Kata Del Gormo was trained in the ways of the Force and achieved the rank of Master within the Jedi Order.
Why does Darth Maul hate the Jedi? Because Maul was raised to hate them. The dark side is innate in Maul, he was born as a warrior, raised in hatred and violence, grow up steeped in the dark side, and then he was abducted by the Sith. Darth Sidious took Maul from his home to train him as his Sith apprentice.
When he dies in Rebels you see Obi-wan holding the dying body of Maul. This is supposed to represent that he's gone beyond hatred or anger towards Maul, and instead feel pity that it had to end this way.
As far as I know, there is no Canon date of birth for Maul, but in Legends, he was born in 54 BBY. In canon, Maul was killed by Obi-Wan Kenobi on Tatooine during the year 2 BBY. If we use the Legends year of birth, then Maul would have been 52 years old when he died.
Finally, Darth Maul himself admitted he wasn't capable of facing Vader alone in Star Wars Rebels. And while the story in question is no longer part of the official Star Wars canon, Darth Vader fought and defeated Maul in comic Star Wars Tales #9.
Anakin Skywalker's birth mystery is solved - his mother, Shmi Skywalker, reveals that there was no father and she can't explain what happened. Qui-Gon Jinn believed that the Force itself created Anakin in Shmi's womb, making him the Chosen One who would bring balance to the Force.
By the time of Episode 3; Anakin is in his prime, and already one of the Jedi Order's most powerful “masters” (although technically still a knight), just behind Obi-Wan, Windu, and Yoda. Maul wouldn't stand a chance.
Ren was good but Rey was able to beat him every time they fought. However, he wasn't even fully trained and even he would have had a massive problem fighting Maul. Even in his older age, Maul was still way more skilled than anyone Rey faced and that would be the end for her. Maul would just be too much for Rey.
It's already been shown in the source material… more than once… that Darth Maul is not on Darth Sidious's level. Every time he dueled Sidious as his apprentice (in Legends) he got easily defeated. In the show Star Wars: The Clone Wars, Palpatine takes on Darth Maul and Savage Opress simultaneously.
