Complex sentence: His father was a successful corporate lawyer and partner of the law firm Debevoise and Plimpton who was appointed by President John F. Kennedy as U.S. deputy ambassador to the United Nations, serving from 1961 to 1965.
Split into simpler sentences: His father was a successful corporate lawyer and partner of the law firm Debevoise and Plimpton. He was appointed by President John F. Kennedy as U.S. deputy ambassador to the United Nations serving from 1961 to 1965.