Simplify the following text for a Grade 9 native English-speaking person.
Original: Frank White ( born September 4 , 1950 in Greenville , Mississippi ) is a retired American baseball player and is a former coach of the Kansas City Royals .
Simplified: Frank White , Jr. ( born September 4 , 1950 in Greenville , Mississippi ) is a former Major League Baseball player , and coach for the Kansas City Royals and their AA affiliate , the Wichita Wranglers .