Complex sentence: The Indy Racing League announced a race there on June 24,2007, the Iowa Corn Indy 250, which was won by Dario Franchitti, who barely nipped Marco Andretti at the finish line.
Split into simpler sentences: The Indy Racing League has announced that they will race there on June 24,2007. This race was won by Dario Franchitti, who barely nipped Marco Andretti at the finish line.