Complex sentence: She screams and jumps out the window while Jim gets stabbed in the stomach she hides in a storage on the boat and when Jason spots her stabs her with the arrow from the harpoon.
Split into simpler sentences: She screams and jumps out the window while Jim gets stabbed in the stomach. She hides in a storage room on the boat, but Jason finds her, stabbing her with the arrow from the harpoon.