Complex sentence: Provincia Arabia Petraea or simply Arabia, was a frontier province of the Roman Empire beginning in the 2nd century; it consisted of the former Nabataean kingdom in Jordan, southern Levant, the Sinai Peninsula and northwestern Arabian peninsula.
Split into simpler sentences: Provincia Arabia Petraea or simply Arabia, was a frontier province of the Roman Empire beginning in the 2nd century. It consisted of the former Nabataean kingdom in the southern Levant, Sinai Peninsula, and northwestern Arabian peninsula.