Complex sentence: Hurrying after the retreating puppet troops, on July 7, Ji's army reconnoitered Dolonnur and the next day, before dawn, the Anti-Japanese Army attacked and captured the Japanese and puppet forces two outer defense lines, outside the city.
Split into simpler sentences: Hurrying after the retreating puppet troops, on July 7th, Ji's army reconnoitered Dolonnur. The next day, before dawn, the Anti-Japanese Army attacked and captured the Japanese and puppet forces two outer defense lines outside the city.