Complex sentence: Although she decided to relinquish the fortune to her father, she gladly took her freedom from betrothal, and returned home only to discover that in her absence, her father had remarried to a sixteen year old girl.
Split into simpler sentences: Although she decided to relinquish the fortune to her father, she gladly took her freedom from betrothal. She returned home only to discover that in her absence her father had remarried, to a sixteen year old girl.