Complex sentence: Thinking that Tom whacked, booped him on the head, Spike begins to whack Tom angrily all around the outside with the golf club down the way, while Jerry, obvious inside drinks Tom's chocolate milk and renders to become visible again.
Split into simpler sentences: Thinking that Tom has whacked him, booped him on the head, Spike begins to whack Tom angrily with the golf club down the way. Meanwhile, inside, Jerry, obvious, drinks Tom's chocolate milk and renders himself to become visible again.