Original sentence: Once in the States he taught primarily at Yale University where he had such notable pupils as Lukas Foss, Norman Dello Joio, Harold Shapero, Ruth Schonthal and Oscar-winning film director George Roy Hill
Edited sentence: Once in the States he taught primarily at Yale University where he had such notable pupils as Lukas Foss, Norman Dello Joio, Harold Shapero, Ruth Schonthal and (ironically) Oscar-winning film director George Roy Hill