Simplify the following text for a Grade 9 native English-speaking person.
Original: Shakhriyar Hamid oglu Mammadyarov ( born 12 April 1985 in Sumgayit , Azerbaijan ) , also known for his Shah nickname , is a chess Grandmaster .
Simplified: Shakhriyar Mamadyarov ( born 12 April 1985 in Sumgayit , Azerbaijan ) is a chess Grandmaster .