Complex sentence: Unsatisfied, Anakin turns to Palpatine, who then reveals himself as Darth Sidious, and manipulates the young Jedi into becoming his Sith apprentice, Darth Vader, with the promise that the dark side holds the power to save Padmé from dying in childbirth.
Split into simpler sentences: Unsatisfied, Anakin turns to Palpatine, who then reveals himself as Darth Sidious. Palpatine manipulates the young Jedi into becoming his Sith apprentice, Darth Vader, with the promise that the dark side holds the power to save Padmé from dying in childbirth.