Simplify the following text for a Grade 10 native English-speaking person.
Original: Sultan Muhammed Shah , Aga Khan III , GCSI , GCMG , GCIE , GCVO , PC ( November 2 , 1877 -- July 11 , 1957 ) was the 48th Imam of the Shia Ismaili Muslims .
Simplified: Aga Khan III , GCSI , GCMG , GCIE , GCVO , PC ( 2 November 1877 â `` 11 July 1957 ) was the 48th Imam of the Shia Ismaili Muslims .