Simplify the following text for a Grade 8 native English-speaking person.
Original: Masakuni Yamamoto ( born April 4 , 1958 in Numazu , Shizuoka , Japan ) is a Japanese former football player and is currently a commentator of football match program of NHK .
Simplified: Masakuni Yamamoto ( born 4 April 1958 ) is a former Japanese football player .