Complex sentence: Boudreau, who was of French and Jewish ancestry, graduated from Thornton Township High School in Harvey, Illinois, and the University of Illinois at Urbana-Champaign, where he was a member of Phi Sigma Kappa fraternity, excelling in sports at both schools.
Split into simpler sentences: Boudreau, who was of French and Jewish ancestry, graduated from Thornton Township High School in Harvey, Illinois. He also graduated from the University of Illinois at Urbana-Champaign, where he was a member of Phi Sigma Kappa fraternity, excelling in sports at both schools.