Simplify the following text for a Grade 7 native English-speaking person.
Original: He has one of the highest winning percentages of any college football coach in history , and is one of only two head coaches to win both a college football national championship and a Super Bowl ( the other being a rival college head coach Jimmy Johnson . )
Simplified: Switzer is one of only two head coaches to win both a college football national championship and a Super Bowl . He has one of the highest winning percentages in the history of college football .