Simplify the following text for a Grade 7 native English-speaking person.
Original: After graduating from Chicago 's Schurz High School in 1929 , Wistert attended the University of Michigan where he was a star athlete in both football and baseball from 1931-1933 .
Simplified: Wistert graduated from Chicago 's Schurz High School in 1929 . He attended the University of Michigan where he was an athlete in both football and baseball in 1931 , 1932 , and 1933 .