Simplify the following text for a Grade 7 native English-speaking person.
Original: When Tony George ( Hulman 's grandson ) inherited the track , he brought more racing to the Speedway , with NASCAR in 1994 ( the Brickyard 400 , known from 2005 to 2009 as the Allstate 400 at The Brickyard ) , and an International Race of Champions ( IROC ) event in 1998 .
Simplified: NASCAR start racing in 1994 with the Brickyard 400 . The International Race of Champions ( IROC ) event was added in 1998 .