Complex sentence: Joel and Ethan graduated from St. Louis Park High School in 1973 and 1976, respectively., and from Bard College at Simon's Rock in Great Barrington, Massachusetts.
Split into simpler sentences: Joel and Ethan graduated from St. Louis Park High School in 1973 and 1976, respectively. They both also graduated from Bard College at Simon's Rock in Great Barrington, Massachusetts.