Complex sentence: Hilly attempts to recreate his "magic machine" to bring Davey back but he repeats a nursery rhyme about the "tommyknockers," but then suffers a seizure and is rushed to the hospital.
Split into simpler sentences: Hilly attempts to recreate his "magic machine" and bring Davey back. Hilly repeats a nursery rhyme about "tommyknockers," but then suffers a seizure and is rushed to the hospital.