Complex sentence: Martín López-Zubero Purcell (born April 23,1969) is a former college and international swimmer with dual Spanish and American citizenship, who was born in the United States but competed for Spain.
Split into simpler sentences: Martín López-Zubero Purcell (born April 23,1969) is a former college and international swimmer with dual Spanish and American citizenship. He was born in the United States but competed for Spain.