Original sentence: The high school's football stadium was used by the National Football League's Philadelphia Eagles in 1987 as the home of their training camp.Valentine is a Super Bowl-winning linebacker who played for the NFL's Pittsburgh Steelers from 1979–1981 as a member of the famous "Steel Curtain" defense
Edited sentence: The high school's football stadium was used by the NFL's Philadelphia Eagles in 1987 as the home of their training camp.Valentine is a Super Bowl-winning linebacker who played for the National Football League's Pittsburgh Steelers from 1979–1981 as a member of the famous "Steel Curtain" defense