Complex sentence: After deciding that his beloved daughter needs a mother's care, Cinderella's father marries Lady Tremaine, a proud woman with two daughters from her first marriage, Anastasia and Drizella.
Split into simpler sentences: After deciding that his beloved daughter needs a mother's care, Cinderella's father marries Lady Tremaine, a proud woman. She too has been married before, and has two daughters from her first marriage, Anastasia and Drizella.