Simplify the following text for a Grade 6 native English-speaking person.
Original: Mariano NicolÃ s GonzÃ lez ( born 5 May 1981 ) is an Argentine footballer who plays for F.C. Porto in Portugal .
Simplified: Mariano GonzÃ lez ( born 5 May 1981 ) is an Argentine football player . He plays for Porto .