Complex sentence: In the film, Harry learns that he is dying of the same disease that his father just died because of learning that Peter's father and Norman were working on a cure using the radioactive spiders, Harry asks Peter for help to find Spider-Man.
Split into simpler sentences: In the film, Harry learns that he is dying of the same disease that his father just died because of. Learning that Peter's father and his father were working on a cure using the radioactive spiders, Harry asks Peter for help to find Spider-Man.