Complex sentence: The alliance army formation was Commander Ma Gui, leading an army of 24,000 Chinese, and an army of 5,500 Koreans were led by general Kim Eung-seo.
Split into simpler sentences: The alliance army formation was led by Commander Ma Gui, leading an army of 24,000 Chinese. An army of 5,500 Koreans was led by general Kim Eung-seo.