Complex sentence: Kristen Joanne Caverly (born September 20,1984) is an American former competitive swimmer who represented the United States at the 2004 Summer Olympics, where she placed 17th in the 200-metre backstroke, just missing qualifying for the semifinals.
Split into simpler sentences: Kristen Joanne Caverly (born September 20,1984) is an Olympic swimmer from the United States. She swam for the USA at the 2004 Olympic Games, where she placed 17th in the 200m Backstroke, just missing qualifying for the Semifinals.