Complex sentence: Year 350 BC was a year of the pre-Julian Roman calendar.In the Roman Empire it was known as the Year of the Consulship of Laenas and Scipio (or, less frequently, year 404 "Ab urbe condita").
Split into simpler sentences: Year 350 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Laenas and Scipio (or, less frequently, year 404 "Ab urbe condita").