Complex sentence: The British conducted a house-to-house fight, retreating out of the town and then around noon, the 9th and 13th brigades of II Corps arrived and conducted an advance to the Messines road.
Split into simpler sentences: The British conducted a house-to-house fight, retreating out of the town. Around noon, the 9th and 13th brigades of II Corps arrived and conducted an advance to the Messines road.