Complex sentence: Joseph Zenzano (c.1710-1790) was a Spanish nobleman, was the Escribano Mayor de Gobierno of Buenos Aires during the viceroyalty of Juan José de Vértiz y Salcedo.
Split into simpler sentences: Joseph Zenzano (c.1710-1790) was a Spanish nobleman. He served as Escribano Mayor de Gobierno of Buenos Aires, in the viceroyalty of Juan José de Vértiz y Salcedo.