Simplify the following text for a Grade 10 native English-speaking person.
Original: Dirk Werner Nowitzki ( born June 19 , 1978 ) is a German professional basketball player who plays for the Dallas Mavericks of the National Basketball Association ( NBA ) .
Simplified: Dirk Nowitzki ( born June 19 , 1978 in WÃ 1\/4 rzburg , Germany ) is a German basketball player . He plays for the Dallas Mavericks in the United States ' National Basketball Association 's ( NBA ) .