Complex sentence: Back in Bikini Bottom, Patrick and Sandy enter SpongeBob's house and they see Gary has become hugely obese from the snail food, his food bowl has a note from SpongeBob, saying he has left so that he will not bother anyone ever again.
Split into simpler sentences: Back in Bikini Bottom, Patrick and Sandy enter SpongeBob's house and they see Gary has become hugely obese from the snail food. Sandy finds that Gary's food bowl has a note from SpongeBob, saying he has left so that he will not bother anyone ever again.