Simplify the following text for a Grade 11 native English-speaking person.
Original: Legault decided to replace the Champ Car race with races from the Grand American Road Racing Association 's Rolex Series and NASCAR 's Nationwide Series , respectively - the latter series ' first race north of the Canadian-United States border .
Simplified: Legault decided to replace the Champ Car race with races from the Grand American Road Racing Association 's Rolex Series and NASCAR 's Nationwide Series .