Complex sentence: On Christmas Day the 6th Airborne Division moved up to take position in front of the spearhead of the German advance; by Boxing Day they had reached their allocated places in the defensive line between Dinant and Namur along the River Meuse.
Split into simpler sentences: On Christmas Day the 6th Airborne Division moved up to take position in front of the spearhead of the German advance. By Boxing Day they had reached their allocated places in the defensive line between Dinant and Namur along the River Meuse.