Simplify the following text for a Grade 8 native English-speaking person.
Original: Ã -- gedei ( 1186-1241 ) was the third son of Genghis Khan and second Great Khan of the Mongol Empire , after his father .
Simplified: Ã -- gedei Khan ( , Ã -- gedei ; also Ogotai or Oktay ; Ogodei ) ( c. 1186 â `` December 11 , 1241 ) was the third son of Genghis Khan and second Great Khan ( Khagan ) of the Mongol Empire by succeeding his father .