Complex sentence: He arrived in New Spain current day Mexico from Spain in 1539,he join the Spanish Conquest of Yucatán in 1541, and he was one of the founders of Mérida Yucatán.
Split into simpler sentences: He arrived in New Spain current day Mexico from Spain in 1539. He joined the Spanish Conquest of Yucatán in 1541, and he was one of the founders of Mérida Yucatán.