Complex sentence: The battle of Leipzig was the bloodiest in the history of the Napoleonic Wars, as casualties on both sides were astoundingly high; estimates range from 80,000 to 110,000 total killed, wounded or missing.
Split into simpler sentences: The battle of Leipzig was the bloodiest in the history of the Napoleonic Wars. Casualties on both sides were astoundingly high; estimates range from 80,000 to 110,000 total killed, wounded or missing.