Complex sentence: In total, some 1,200 of the survivors had made it ashore at Frogn near Drøbak and the guardsmen were supposed to take all the Germans prisoner, but mainly focused on tending for the many wounded and dying.
Split into simpler sentences: In total, some 1,200 of the survivors had made it ashore at Frogn near Drøbak. The guardsmen were supposed to take all the Germans prisoner, but mainly focused on caring for the many wounded and dying.