Question: Herbert Orin "Fritz" Crisler, was an American college football coach who is best known as "the father of two-platoon football," an innovation in which separate units of players were used for offense and defense, before coaching, he played football at the University of Chicago under who, who nicknamed him Fritz after violinist Fritz Kreisler?
Sentence (from "Paul White (American football)"): He also played professional football for the Pittsburgh Steelers in 1947.
Relevant evidence: No