Complex sentence: He was slow to criticize its most infamous member, Wisconsin's Republican junior Senator Joseph McCarthy, who ultimately was condemned by the Senate for "conduct contrary to Senate traditions" in his vehement investigation of alleged communist infiltration of the U.S. government.
Split into simpler sentences: He was slow to criticize its most infamous member, Wisconsin's Republican junior Senator Joseph McCarthy. McCarthy later was condemned by the Senate for "conduct contrary to Senate traditions" in his vehement investigation of alleged communist infiltration of the U.S. government.