Complex sentence: The surrounding area has been inhabited since the Neolithic and was the location of the ancient Thracian royal city of Kabyle founded or refounded by Philip II of Macedon as an Ancient Greek "polis".
Split into simpler sentences: The surrounding area has been inhabited since the Neolithic and was the location of the ancient Thracian royal city of Kabyle. It was founded or refounded by Philip II of Macedon as an Ancient Greek "polis".