Simplify the following text for a Grade 9 native English-speaking person.
Original: Robinson 's Hollywood exploits , however , did not sit well with Dodgers co-owner Walter O'Malley , who referred to Robinson as `` Rickey 's prima donna '' .
Simplified: Robinson 's Hollywood acting , however , did not sit well with Dodgers co-owner Walter O'Malley . He called Robinson `` Rickey 's prima donna '' .