Complex sentence: Meg arrives to see Paul being devoured by the growing Blob and while trying to free him his arm is torn from his body, Meg is thrown against a wall and knocked unconscious and the Blob oozes out of the hospital.
Split into simpler sentences: Meg arrives to see Paul being devoured by the growing Blob. While trying to free him Meg is thrown against a wall and knocked unconscious, and the Blob oozes out of the hospital.