Complex sentence: While Patton was later reassigned, he was not relieved and would continue to serve in the European theater, where he would later command the U.S. Third Army, which in 281 days of continuous combat advanced further and faster than any army in military history.
Split into simpler sentences: While Patton was later reassigned, he was not relieved and would continue to serve in the European theater, where he would later command the famous U.S. Third Army. In 281 days of continuous combat, Patton's Third Army advanced further and faster than any army in military history.