Original sentence: Super Bowl IX was a game that matched two of the NFL's best defenses -- Pittsburgh's Steel Curtain against the Purple People Eaters of Minnesota -- and two legendary quarterbacks: Terry Bradshaw and Fran Tarkenton, respectively
Edited sentence: Super Bowl IX was a game that matched two of the NFL's greatest ever defenses -- Pittsburgh's Steel Curtain against the Purple People Eaters of Minnesota -- and two legendary quarterbacks: Terry Bradshaw and Fran Tarkenton, respectively