Simplify the following text for a Grade 5 native English-speaking person.
Original: Marcos dos Santos AssunÃ Ã # o ( born 25 July 1976 in Caieiras , SÃ # o Paulo ) is a Brazilian footballer who plays for Sociedade Esportiva Palmeiras .
Simplified: Marcos AssunÃ Ã # o ( born 25 July 1976 ) is a Brazilian football player .