Complex sentence: It is one of the oldest cities in Mexico, after Veracruz, Veracruz, and Mexico City--following the fall of Tenochtitlan in 1521, the Spanish conquistadors were quick to reach the west coast.
Split into simpler sentences: It is one of the oldest cities in Mexico, after Veracruz, Veracruz, and Mexico City. Following the fall of Tenochtitlan in 1521, the Spanish conquistadors were quick to reach the west coast.