Complex sentence: Seeing a photo of an alien in a magazine, Bigelow soon finds Margaret, who is one of the aliens herself, and warns Bigelow to escape with their daughter to protect her from the aliens, who want to take her to their homeworld.
Split into simpler sentences: Seeing a photo of an alien in a magazine, Bigelow soon finds "Margaret", who is nowone of the aliens herself. She warns Bigelow to escape with their daughter to protect her from the aliens, who want to take her to their homeworld.