Complex sentence: The Ptolemies were displaced from all this region by the Seleucids, the conflict between these two groups had enabled the Arab Nabateans to extend their kingdom northwards well beyond Petra in Edom.
Split into simpler sentences: The Ptolemies were displaced from all this region by the Seleucids. The conflict between these two groups had enabled the Arab Nabateans to extend their kingdom northwards well beyond Petra in Edom.