Complex sentence: On his return, Hunyadi tried frantically to salvage the king's body, but all he could accomplish was to organize the retreat of the remains of his army; it suffered thousands of casualties in its chaos, and was virtually annihilated.
Split into simpler sentences: On his return, Hunyadi tried frantically to salvage the king's body but all he could accomplish was to organize the retreat of the remains of his army. It suffered thousands of casualties in its chaos, and was virtually annihilated.