Complex sentence: The other scientist, Dan, later discovers the miscarriage was the cause of Nola's death in real life and that Robert, Nola's real life husband, never forgave himself for her death.
Split into simpler sentences: The other scientist, Dan, later discovers the miscarriage was the cause of Nola's death in real life. Dan discovers that Robert, Nola's real life husband, never forgave himself for her death.