Complex sentence: In 2005, Goggins entered the 24 hour race in San Diego and was able to run 100 miles in under 19 hours, despite never having run a marathon before.
Split into simpler sentences: In 2005, Goggins entered the 24 hour race in San Diego. Goggins was able to run 100 miles in under 19 hours, an impressive feat for someone who had never ran a marathon before.