Complex sentence: Aaron Wells Peirsol (born July 23,1983) is an American backstroke swimmer and world record holder for the 100 and 200 m backstroke (long course).
Split into simpler sentences: Aaron Wells Peirsol (born July 23,1983) is an American swimmer who specialises in the backstroke. Individually, he currently holds the world record in the 100 and 200-meter backstroke (long course).