Complex sentence: His career went national when he became involved in the 1998 Winter Heat Series shown on ESPN at Tucson Raceway Park, during which he raced against other current NASCAR drivers Greg Biffle, Kevin Harvick, Kurt Busch, and Ron Hornaday.
Split into simpler sentences: His career went national when he became involved in the 1998 Winter Heat Series shown on ESPN at Tucson Raceway Park. He raced against other current NASCAR drivers Greg Biffle, Kevin Harvick, Kurt Busch, and Ron Hornaday.