Complex sentence: The 1st and 2nd Battalions, ICCB would assault Amman from the front while the 2nd Brigade to their left would circle around north and approach Amman from the rear.
Split into simpler sentences: The 1st and 2nd Battalion's, ICCB would assault Amman from the front. While the 2nd Brigade to their left would circle around north and approach Amman from the rear.