Complex sentence: The prisoners were ordered to lie face down on a track outside the village, and Edilsultanov selected five men from his unit to slit each of their throats; the sixth (Alexey Polagaev) was killed by Edilsultanov himself.
Split into simpler sentences: The prisoners were ordered to lie face down on a track outside the village, and Edilsultanov selected five men from his unit to slit their throats. The sixth (Alexey Polagaev) was killed by Edilsultanov himself.