Simplify the following text for a Grade 7 native English-speaking person.
Original: He is the son of two-time NASCAR Grand National Champion Ned Jarrett , younger brother of Glenn Jarrett , a former NASCAR driver himself and pit commentator , father of former Busch Series racer Jason Jarrett and cousin of Todd Jarrett .
Simplified: Jarrett has been called one of NASCAR 's 50 greatest drivers . Dale Jarrett retired in 2008 and now does Commentary for ESPN .