Complex sentence: During the 16th century there was a great increase in the number of literary and artistic academies in Rome, inspired by the Renaissance, all of which assumed odd and fantastic names, as was the fashion at the time.
Split into simpler sentences: During the 16th century, there was a great increase in the number of literary and artistic academies in Rome. Inspired by the Renaissance, the academies assumed odd and fantastic names, as was the fashion at the time.