Complex sentence: He was elected to the American Academy of Arts and Sciences in 1982, and served as the President of the International Society of Political Psychology in 1989-1990 and as the President of the American Political Science Association in 1997-1998.
Split into simpler sentences: He was elected to the American Academy of Arts and Sciences in 1982. He served as the President of the International Society of Political Psychology in 1989-1990 and as the President of the American Political Science Association in 1997-1998.