Simplify the following text for a Grade 6 native English-speaking person.
Original: Koji Sakamoto ( born December 3 , 1978 in Yasu , Shiga , Japan ) is a Japanese football player currently playing for Japanese club Shonan Bellmare .
Simplified: Koji Sakamoto ( born 3 December 1978 ) is a Japanese football player . He plays for Shonan Bellmare .