Complex sentence: In 550 BC Rome were the second largest city in Italy only second to Tarentum it had an area of about 285 hectares (1.1 sq mile) and an estimated population of 35,000.
Split into simpler sentences: In 550 BC Rome was the second largest city in Italy, with Tarentum being the largest. It had an area of about 285 hectares (1.1 sq mile) and an estimated population of 35,000.