Complex sentence: Boneo y Morales was named governor of Texas on December 17,1743 and little after he was at Presidio of Nuestra Señora del Pilar de Los Adaes.
Split into simpler sentences: Boneo y Morales was appointment governor of Texas on December 17,1743. So, shortly after he was at Presidio of Nuestra Señora del Pilar de Los Adaes.