Simplify the following text for a Grade 5 native English-speaking person.
Original: Erik Olof Mellberg ( born September 3 , 1977 in AmnehÃ rad , GullspÃ ng ) is a Swedish international footballer currently playing for Olympiacos in the Greek Superleague .
Simplified: Olof Mellberg ( born 3 September 1977 ) is a Swedish football player . He plays for Olympiacos and Sweden national team .