Simplify the following text for a Grade 6 native English-speaking person.
Original: However , over the last several years , a number of Sprint Cup drivers have run both the Nationwide and Sprint Cup series events each weekend , using the Nationwide race as a warm-up to the Cup event at the same facility .
Simplified: The three largest racing series run by NASCAR are the Sprint Cup , the Nationwide Series and the Camping World Truck Series . The Sprint Cup Series is the highest level of racing in NASCAR .