Complex sentence: Afterwards, the Iraqi Army began conducting an offensive against the Anbar region, the stronghold of ISIS, with the stated goal of bringing the region under government control while heavy shelling on Fallujah weakened the ISIS forces there.
Split into simpler sentences: Afterwards, the Iraqi Army began conducting an offensive against the Anbar region, the stronghold of ISIS, with the stated goal of bringing the region under government control. While heavy shelling on Fallujah weakened the ISIS forces there.