Complex sentence: Previously, Walden had played 3 years in the Canadian Football League from 1961-1963 He was a part of the Pittsburgh Steelers' Super Bowl IX and Super Bowl X winning teams.
Split into simpler sentences: Previously, Walden had played 3 years in the Canadian Football League from 1961-1963. Walden was a part of the Pittsburgh Steelers' Super Bowl IX and Super Bowl X winning teams.