Original sentence: ) Pittsburgh won four Super Bowls (IX, X, XIII, and XIV) behind the coaching of Chuck Noll and play of Terry Bradshaw, Lynn Swann, and Franco Harris—each receiving at least one MVP award—and their "Steel Curtain" defense
Edited sentence: ) Pittsburgh won four Super Bowls (IX, X, XIII, and XIV) behind the coaching of Chuck Noll and play of Terry Bradshaw, Lynn Swann, and Franco Harris -- each receiving at least one MVP award -- and their "Steel Curtain" defense.However, it should be noted that both the Steelers and Colts were original NFL teams before the merger