Complex sentence: During the Roman rule, the first city walls were constructed (297 AD) and later, the greater walls were built as per the command of the Roman emperor Constantius II. After the Romans, the Persians came to power and were succeeded by the Muslim Arabs.
Split into simpler sentences: During the Roman rule, the first city walls were constructed in 297. Later, the greater walls were built as per the command of the Roman emperor Constantius II. After the Romans, the Persians came to power and were succeeded by the Muslim Arabs.