Complex sentence: He stayed there for the 1978 season before being released, even winning Super Bowl XIII against the Dallas Cowboys, and then he was picked up by the Seattle Seahawks in 1980, where he would stay for three seasons.
Split into simpler sentences: He stayed there for the 1978 season before being released, and won Super Bowl XIII against the Dallas Cowboys. He was then picked up by the Seattle Seahawks in 1980, where he stayed for three seasons.