Simplify the following text for a Grade 9 native English-speaking person.
Original: As a football player , Wistert played for consecutive undefeated National Championship teams in 1932 and 1933 and was a consensus All-American in 1933 .
Simplified: As a football player , Wistert played for National Championship teams that never lost a game in 1932 and 1933 and was a chosen All-American in 1933 .