Complex sentence: Belem Guerrero Méndez (born March 8,1974 in Mexico City) is a Mexican track cyclist who represented Mexico at the 2004 Summer Olympics in Athens.
Split into simpler sentences: Belem Guerrero Méndez (born March 8,1974 in Mexico City, Mexico) is an athlete from Mexico. She competes in cycling and represented Mexico at the 2004 Summer Olympics in Athens.