Complex sentence: In 2007, it was sponsored by Lifelock in 2007, an Internet protection firm, but is being billed as the Kansas 400 by the speedway for the 2008 race, which will be held on September 28.
Split into simpler sentences: In 2007, it was sponsored by Lifelock, an Internet protection firm. It is being billed as the Kansas 400 by the speedway for the 2008 race, which will be held on September 28.