Complex sentence: The couple divorced in September 1936, and he then married Eleanor Brown (also a divorcee) who was his nurse who cared for him when he was sick and fell in love and married him in 1937 to keep him from getting sick again.
Split into simpler sentences: The couple divorced in September 1936, and he then married Eleanor Brown (also a divorcee), who was his nurse, who cared for him when he was sick. She fell in love and married him in 1937, to keep him from getting sick again.