Complex sentence: The regiment lost its whole artillery and much of the loot from the city; the remnants of the battalion, which was drunk at the time of the midnight attack, fled in disarray discarding their personal weapons.
Split into simpler sentences: The regiment lost its whole artillery and much of the loot from the city. The remnants of the battalion, which was drunk at the time of the midnight attack, fled in disarray discarding even their personal weapons.