Simplify the following text for a Grade 6 native English-speaking person.
Original: Nobuyuki Zaizen ( ; 19 born October 1976 ) is a Japanese professional footballer who plays for Muangthong United in the Thai Premier League , as a midfielder .
Simplified: Nobuyuki Zaizen ( born 19 October 1976 ) is a Japanese football player . He plays for Muangthong United .