Complex sentence: Buttons with buttonholes used to fasten or close garment, being the most convenient method before the introduction of the zipper, appear in the 13th century Germany as indigenous innovation.
Split into simpler sentences: Buttons with buttonholes used to fasten or close garment, being the most convenient method before the introduction of the zipper. A REVIEW (Hungarian Academy of Sciences) German buttons appear in the 13th century Germany as indigenous innovation.