Complex sentence: One of the division's mechanized reconnaissance platoons receives orders to hold their position while under counterattack from the Germans; the out-numbered platoon are also on the receiving end of mortar fire from their own side.
Split into simpler sentences: One of the division's mechanized reconnaissance platoons is ordered to hold their position when the Germans counterattack. The outnumbered platoon is also on the receiving end of mortar fire from their own side.