Complex sentence: The St. Louis Rams ran the Coryell system successfully under coordinator and then head coach Mike Martz; earlier still, Joe Gibbs won 3 Super Bowls running his version of the Coryell offense when he was head coach of the Washington Redskins.
Split into simpler sentences: The St. Louis Rams ran the Coryell system successfully under coordinator and then head coach Mike Martz. Earlier still, Joe Gibbs won 3 Super Bowls running his version of the Coryell offense when he was head coach of the Washington Redskins.