Complex sentence: Year 348 BC was a year of the pre-Julian Roman calendar.In the Roman Empire it was known as the Year of the Consulship of Corvus and Laenas (or, less frequently, year 406 "Ab urbe condita").
Split into simpler sentences: Year 348 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Corvus and Laenas (or, less frequently, year 406 "Ab urbe condita").