Complex sentence: A Lola Aston Martin competed at the 2010 12 Hours of Sebring, which marked the first time the Lola-Aston Martin entered a race in the United States.
Split into simpler sentences: A Lola Aston Martin has been scheduled to compete at the 2010 12 Hours of Sebring. This marks the first time the Lola Aston Martin will compete in the United States.