Simplify the following text for a Grade 7 native English-speaking person.
Original: Pierre Monteux ( born Paris , 4 April 1875 ; died Hancock , Maine , 14 July 1964 ) was an French-born conductor who later became an American citizen .
Simplified: Pierre Monteux ( April 4 , 1875 -- July 1 , 1964 ) was an orchestra conductor .