Complex sentence: He fell to the dark side of the Force, however, apparently corrupted by the First Order's Supreme Leader, Snoke, and helped to destroy the Jedi Order-much like his grandfather, Darth Vader.
Split into simpler sentences: He fell to the dark side, however, apparently corrupted by the First Order's Supreme Leader, Snoke. He then helped to destroy the Jedi Order-much like his grandfather, Darth Vader.