Simplify the following text for a Grade 8 native English-speaking person.
Original: The Champ Car World Series merged into the Indy Racing League IndyCar Series prior to the 2008 season , and Cosworth does not currently provide engines to any American open wheel racing series .
Simplified: The Champ Car World Series merged into the Indy Racing League IndyCar Series prior to the 2008 season . Cosworth does not currently provide engines to any American open wheel racing series .