Simplify the following text for a Grade 9 native English-speaking person.
Original: Sir Doctor Frederick Grant Banting , KBE , MC , FRSC ( November 14 , 1891 -- February 21 , 1941 ) was a Canadian medical scientist , doctor and Nobel laureate noted as one of the main discoverers of insulin .
Simplified: Frederick Grant Banting ( November 14 , 1891 - February 21 , 1941 ) was a Canadian doctor .