Complex sentence: Gary then watches as Spongebob has a "conversation" with the patty and prepares to eat it until he is eaten by the Alaskan Bull Worm, causing Gary to faint into slumber.
Split into simpler sentences: Gary then watches as SpongeBob has a "conversation" with the patty. As SpongeBob prepares to eat the patty, he is eaten by the Alaskan Bull Worm, causing Gary to faint into slumber.