Complex sentence: Mariano Rubén Puerta (born September 19,1978 in San Francisco, Córdoba) is a former Argentine professional male tennis player best known for making the final of the French Open in 2005, where he lost to Rafael Nadal in four sets.
Split into simpler sentences: Mariano Rubén Puerta (born September 19,1978 in San Francisco, Córdoba) is a former Argentine professional male tennis player. His best performance in a Grand Slam was reaching the final of the French Open in 2005, where he lost to Rafael Nadal in four sets.