Complex sentence: The other principal production technology in the industry is steam reforming which is a chemical process used to convert natural gas and steam into a syngas containing hydrogen and carbon monoxide; although carbon dioxide is a byproduct.
Split into simpler sentences: The other principal production technology in the industry is Reforming. Steam reforming is a chemical process used to convert natural gas and steam into a syngas containing hydrogen and carbon monoxide with carbon dioxide is a byproduct.