Complex sentence: Their eldest daughter, Anne Willing, was a prominent socialite and married one of the richest men in America at that time, William Bingham; her younger sisters married William Jackson, Henry Clymer, Thomas Willing Francis (a cousin), and Richard Peters.
Split into simpler sentences: Their eldest daughter, Anne Willing, was a prominent socialite and married one of the richest men in America at that time, William Bingham. Other daughters married William Jackson, Thomas Willing Francis (a cousin), and Richard Peters.