Complex sentence: Masonite is a type of hardboard formed using the Mason method (invented by William H. Mason) by taking wooden chips and blasting them into long fibres using steam and then forming them into boards.
Split into simpler sentences: Masonite is a type of hardboard invented by William H. Mason. It is formed using the Mason method, using wooden chips and blasting them into long fibres with steam and then forming them into boards.