Simplify the following text for a Grade 9 native English-speaking person.
Original: Michael John Sweeney ( born July 22 , 1973 in Orange , California ) is a first baseman and designated hitter in Major League Baseball for the Oakland Athletics .
Simplified: Michael John `` Mike '' Sweeney ( born July 22 , 1973 in Orange , California ) is a former Major League Baseball first baseman .