Complex sentence: A rebel spokesman stated that their goal was the expulsion of ISIL from the region and reaching the city of Deir ez-Zor which will be supported by the anti-ISIL coalition, rather than having Syrian Democratic Forces capture it.
Split into simpler sentences: A rebel spokesman stated that their goal was the expulsion of ISIL from the region and reaching the city of Deir ez-Zor. The would be supported by the anti-ISIL Coalition, rather than having Syrian Democratic Forces capture it.