Complex sentence: The airborne division's brigades prepared to hold the positions they had captured, with the 5th Parachute Brigade, as the division's depth formation, dug into the east of the River Orne bridge.
Split into simpler sentences: The airborne division's brigades now prepared to hold the positions they had captured. With the 5th Parachute Brigade as the divisions depth formation dug in to the east of the River Orne bridge.