Simplify the following text for a Grade 7 native English-speaking person.
Original: After a short season , Robinson returned to California in December 1941 to pursue a career as running back for the Los Angeles Bulldogs of the Pacific Coast Football League .
Simplified: After a short season , Robinson returned to California in December 1941 . There he tried for a career as running back for the Los Angeles Bulldogs of the Pacific Coast Football League .