Complex sentence: The design of stove means that it can operate on about half as much fuel as a traditional open fire and can use smaller diameter wood.If they are insulated and raised from the floor this reduces the danger of children burning themselves.
Split into simpler sentences: The design of stove means that it can operate on about half as much fuel as a traditional open fire and can use smaller diameter wood. They are insulated and raised from the floor which reduces the danger of children burning themselves.