Simplify the following text for a Grade 9 native English-speaking person.
Original: On 15 November 2004 , the sale of Cosworth was completed to Champ Car World Series owners Gerald Forsythe and Kevin Kalkhoven They are the current owners of the Cosworth Group .
Simplified: On 15 November 2004 , the sale of Cosworth was completed , to Champ Car World Series owners Gerald Forsythe and Kevin Kalkhoven , the current Cosworth Group .