Complex sentence: Christine married Colin Appleby, but he died in a car crash, after her marriage Christine lodged with Elsie Tanner and had a relationship with the much older Frank Barlow, but it didn't last long.
Split into simpler sentences: Christine married Colin Appleby, but he died in a car crash. After her marriage Christine lodged with Elsie Tanner and had a relationship with the much older Frank Barlow, but it didn't last long.