Complex sentence: Before the events of the series, he was a noble businessman but then the Rocket Monkeys began to crave him and he's been trying to get revenge on the Rocket Monkeys for trying to eat him and especially forcing him into the dark side.
Split into simpler sentences: Before the events of the series, he was a noble businessman. But then the Rocket Monkeys began to crave him, and he's been trying to get revenge on them for trying to eat him and especially for forcing him into the dark side.