Complex sentence: Year 347 BC was a year of the pre-Julian Roman calendar.In the Roman Empire it was known as the Year of the Consulship of Venno and Torquatus (or, less frequently, year 407 "Ab urbe condita").
Split into simpler sentences: Year 347 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Venno and Torquatus (or, less frequently, year 407 "Ab urbe condita").