Simplify the following text for a Grade 7 native English-speaking person.
Original: Joseph Riddick Hendrick III ( born July 12 , 1949 ) , better known as Rick Hendrick , is the current owner of the American NASCAR team , Hendrick Motorsports and founder of the Hendrick Automotive Group and Hendrick Marrow Program .
Simplified: Joseph Riddick Hendrick III ( born July 12 , 1949 ) is the owner of the NASCAR race team Hendrick Motorsports .