Simplify the following text for a Grade 6 native English-speaking person.
Original: Roman Weidenfeller ( born 6 August 1980 in Diez , Germany ) is a German footballer who plays as a goalkeeper for Borussia Dortmund in the German Bundesliga .
Simplified: Roman Weidenfeller ( born 6 August 1980 ) is a German football player . He plays for Borussia Dortmund .