Simplify the following text for a Grade 9 native English-speaking person.
Original: As well as this , in Motorcycling Grand Prix , Marlboro sponsored the Kenny Roberts run Yamaha team in 500cc as well as one of his former rider , Wayne Rainey 's team in the 250cc class .
Simplified: In Motorcycling Grand Prix , Marlboro sponsored the Yamaha team in 500cc and 250cc class .