Simplify the following text for a Grade 6 native English-speaking person.
Original: Yoshiharu Ueno ( , born April 21 , 1973 in Saitama , Japan ) is a former Japanese football player who played for the J-league team Yokohama F. Marinos .
Simplified: Yoshiharu Ueno ( born 21 April 1973 ) is a former Japanese football player . He has played for Yokohama F. Marinos and Japan national team .