Complex sentence: A videotape informs him that he has one minute to retrieve the key from behind his right eye with a scalpel, but he cannot bring himself to do so and is killed when the mask closes around his head.
Split into simpler sentences: A videotape informs him he has one minute to extract the key from behind his right eye with a scalpel. He is unable to bring himself to do it, and is killed when the mask closes around his head.