Complex sentence: They find an exception in the form of a rocket called "Rocket to Your Doom" that takes them to Rigel VII, the home planet of Kang and Kodos, where the inhabitants try to eat Homer in a giant fondue.
Split into simpler sentences: They find an exception in the form of a rocket called "Rocket to Your Doom" that takes them to Rigel VII, the home planet of Kang and Kodos. Once the Simpson are on Rigel VII, the inhabitants try to eat Homer in a giant fondue.