Complex sentence: Metal fume fever is illness caused primarily by exposure to fumes from zinc oxide (ZnO) or magnesium oxide (MgO), often through breathing fumes created by heating or welding certain metals, such as galvanized steel.
Split into simpler sentences: Metal fume fever is illness caused primarily by exposure to certain metal fumes. Chemicals such as Zinc oxide (ZnO) or magnesium oxide (MgO), often cause this through breathing fumes created by heating or welding certain metals, such as galvanized steel.