Complex sentence: In 1892, organ maker Anselmo Gavioli patented the "book organ," a series of folded sheets of cardboard, which allowed air through holes punched on the pages of the folded book, to make the pipes of the organ sound.
Split into simpler sentences: In 1892, organ maker Anselmo Gavioli patented the "book organ," with a series of folded sheets of cardboard. Holes punched on the pages of the folded book allowed air to pass through, to make the pipes of the organ sound.