Simplify the following text for a Grade 8 native English-speaking person.
Original: Sir John Young Stewart , OBE ( born 11 June 1939 ) , better known as Jackie Stewart , and nicknamed The Flying Scot , is a Scottish former racing driver and team owner .
Simplified: Sir John Young `` Jackie '' Stewart OBE ( born 11 June 1939 in Milton , United Kingdom ) is a Scottish former racing driver and team owner .