Complex sentence: Despite the failure of his mission, he retained the confidence of the emperor, and in 1539 was appointed ambassador at Venice; there he procured copies of the Greek manuscripts belonging to Cardinal Bessarion, and acquired other rare codices from the monastery of Mount Athos.
Split into simpler sentences: Despite the failure of his mission, he retained the confidence of the emperor, and in 1539 was appointed ambassador at Venice. He procured copies of the Greek manuscripts belonging to Cardinal Bessarion, and acquired other rare codices from the monastery of Mount Athos.