Simplify the following text for a Grade 10 native English-speaking person.
Original: Robert Thurston ( `` Bob '' ) Dart ( 3 September 1921 -- 6 March 1971 ) , was a British musicologist , conductor and keyboard player .
Simplified: Thurston Dart ( born 3 September 1921 ; died 6 March 1971 ) , was a British musicologist , conductor and keyboard player .