Simplify the following text for a Grade 9 native English-speaking person.
Original: Gabriel IvÃ n Heinze ( ; born 19 April 1978 in Crespo , Entre RÃ os ) is an Argentine footballer who plays for Olympique de Marseille in France and Argentina .
Simplified: Gabriel Heinze ( born 19 April 1978 ) is an Argentine football player . He plays for Olympique Marseille and Argentina national team .