Complex sentence: The race was founded by Dr. Don Panoz, the owner of the Panoz Motor Sports Group, which also owns the American Le Mans Series, Road Atlanta, Sebring International Raceway, and Mosport International Raceway.
Split into simpler sentences: The race was founded by Dr. Don Panoz, the owner of the Panoz Motor Sports Group. Panoz also owns the American Le Mans Series, Road Atlanta, Sebring International Raceway, and Mosport International Raceway.