Complex sentence: In 1974 he served as a backup quarterback for the Chicago Fire of the World Football League and in 1975 he was the starting quarterback for the San Antonio Wings of the World Football League where he led the league in passing yards and touchdowns.
Split into simpler sentences: In 1974 he served as a backup quarterback for the Chicago Fire of the World Football League. In 1975 he was the starting quarterback for the San Antonio Wings of the World Football League where he led the league in passing yards and touchdowns.