Simplify the following text for a Grade 8 native English-speaking person.
Original: NicolÃ s AndrÃ s Burdisso ( born 12 April 1981 in Altos de ChipiÃ n ) is an Argentine professional footballer who plays as a defender for A.S. Roma .
Simplified: NicolÃ s Burdisso ( born 12 April 1981 ) is an Argentine football player .