Complex sentence: Shawn mentions "one night Victor's dad goes crazy and whacks him in the face with a hatchet" while looking at "ghost lights"; however, Mrs. Permatteo sees someone in the trees, and Shawn accidentally crashes into a rock, sinking the boat.
Split into simpler sentences: Shawn mentions "one night Victor's dad goes crazy and whacks him in the face with a hatchet" while looking at "ghost lights". However, Mrs. Permatteo sees someone in the trees, and Shawn accidentally crashes into a rock, sinking the boat.