Complex sentence: In Greek and Roman antiquity, it was known as Heliopolis ("Hēlioúpolis ","Sun City"): it still possesses some of the best-preserved Roman ruins in Lebanon, including one of the largest temples of the empire.
Split into simpler sentences: In Greek and Roman antiquity, it was known as Heliopolis. It still possesses some of the best-preserved Roman ruins in Lebanon, including one of the largest temples of the empire.