Complex sentence: The second daughter, Genny, marries a neighboring settler but is abused and then abandoned by him when he runs off with her younger sister Achsa, causing Genny to suffer a temporary attack of paranoia.
Split into simpler sentences: The second daughter, Genny, marries a neighboring settler who turns out to be abusive toward her. He later runs off with her younger sister Achsa, causing Genny to suffer a temporary attack of paranoia.