Simplify the following text for a Grade 8 native English-speaking person.
Original: After graduating from PJC in spring 1939 , Robinson transferred to UCLA , where he became the school 's first athlete to win varsity letters in four sports : baseball , basketball , football , and track .
Simplified: After graduating from PJC in spring 1939 , Robinson transferred to UCLA . There he became the school 's first athlete to win varsity letters in four sports : baseball , basketball , football , and track .