Complex sentence: At Hochkirch, Prussian discipline and the bonds of regimental cohesion had prevailed; at Kunersdorf, his army panicked and disintegrated before his eyes, especially in the last hour of the battle.
Split into simpler sentences: At Hochkirch, Prussian discipline and the bonds of regimental cohesion had prevailed. At Kunersdorf, his army panicked and disintegrated before his eyes, especially in the last hour of the battle.