Complex sentence: A special device called a yogurt barrel ("lào tǒng", 酪桶) is used for further production processes, which is a barrel with a heat chamber in the center, providing the heat needed for baking.
Split into simpler sentences: A special device called a yogurt barrel ("lào tǒng", 酪桶) is used during production. A lào tǒng contains a heat chamber in the center, providing the heat needed for baking.