Simplify the following text for a Grade 6 native English-speaking person.
Original: KÅ ji Nakata ( ä ç '' æ ä Nakata KÅ ji ; born 9 July 1979 in Otsu , Shiga , Japan ) is a Japanese football ( soccer ) player who played at both the Football World Cup 2002 , and the Football World Cup 2006 .
Simplified: KÅ ji Nakata ( born 9 July 1979 ) is a Japanese football player .