Simplify the following text for a Grade 8 native English-speaking person.
Original: Sir Michael John Gambon , CBE ( born 19 October 1940 ) , is an acclaimed Irish-born actor with a career that spans nearly five decades and includes a variety of roles in theater , television and film .
Simplified: Sir Michael John Gambon , CBE ( born 19 October 1940 ) is an Irish-born British actor who has worked in theater , television and film .