Complex sentence: As the stove became more sophisticated, it was moved from the center of house to the side, and finally, by the late Kofun period, almost all houses had a stove at one end of the house.
Split into simpler sentences: As the stove became more sophisticated, the stove moved from the center of house to the side, and finally to the end of a house. By the late Kofun period, almost all houses had a stove at an end of the house.