Complex sentence: He was prolific, and worked not only in the region of Veneto or Venetia, one of Italy's twenty regions, but also in Germany and Spain, and is considered among the last "Grand manner" fresco painters from the Venetian republic.
Split into simpler sentences: He was prolific, and worked not only in the region of Veneto or Venetia, one of Italy's twenty regions, but also in Germany and Spain. Tiepol is considered among the last "Grand manner" fresco painters from the Venetian republic.