Simplify the following text for a Grade 11 native English-speaking person.
Original: Sir Ernest Alexander Campbell MacMillan , CC ( August 18 , 1893 -- May 6 , 1973 ) was an internationally renowned Canadian orchestral conductor and composer , and Canada 's only `` Musical Knight '' .
Simplified: Sir Ernest MacMillan ( born Mimico , Ontario , 18 August 1893 ; died 6 May 1973 ) was a famous Canadian conductor and composer .