Simplify the following text for a Grade 7 native English-speaking person.
Original: Naoki Matsuda , born 14 March 1977 in KiryÅ `` , Gunma ) is a Japanese footballer who plays for Matsumoto Yamaga FC , as a left defender .
Simplified: Naoki Matsuda ( born 14 March 1977 ) is a Japanese football player .