Simplify the following text for a Grade 9 native English-speaking person.
Original: Kevin Wayne Durant ( born September 29 , 1988 ) is an American professional basketball player for the Oklahoma City Thunder of the National Basketball Association ( NBA ) .
Simplified: Kevin Wayne Durant ( born September 29 , 1988 in Washington , D.C. , United States ) is an American professional basketball player for the Oklahoma City Thunder of the NBA .