Complex sentence: Twice a competitor in the 24 Hours of Daytona endurance race, he currently races part-time in the NASCAR Nationwide Series, where in 2009 he became the first Puerto Rican driver to compete in a top level NASCAR series.
Split into simpler sentences: Twice a competitor in the 24 Hours of Daytona endurance race. In 2009, he became the first Puerto Rican driver to compete in a top level NASCAR series.