Simplify the following text for a Grade 6 native English-speaking person.
Original: Mattias Jonson ( born January 16 , 1974 ) is a Swedish professional football player , who plays as a midfielder for Swedish club DjurgÃ rdens IF in the Allsvenskan championship .
Simplified: Mattias Jonson ( born 16 January 1974 ) is a Swedish football player .