Complex sentence: The Estonian units against them ran out of ammunition, just in time, an improvised platoon of the SS-Panzergrenadier Regiment 24 "Danmark" arrived to their rescue, and another Soviet attack was repulsed.
Split into simpler sentences: The Estonian units against them ran out of ammunition. Just in time, an improvised platoon of the "Danmark" Regiment arrived to their rescue, and another Soviet attack was repulsed.