Simplify the following text for a Grade 5 native English-speaking person.
Original: In 2006 , Hamlin ran his first full season in the NASCAR Nextel Cup Series , and during the year he drove in both the Nextel Cup and Busch Series full-time .
Simplified: In 2006 , Hamlin raced his first full season in the NASCAR Nextel Cup Series . He also drove in the Busch Series full-time .