Complex sentence: Anton Roberto (c.1521-1590s) was a Spanish conquistador, served as alguacil of Asunción, he had arrived in the expedition of Álvar Núñez Cabeza de Vaca.
Split into simpler sentences: Anton Roberto (c.1521-1590s) was a Spanish conquistador who served as the alguacil of Asunción. He arrived from Spain in the expedition of Álvar Núñez Cabeza de Vaca.