Complex sentence: A Penrose tiling is a non-periodic tiling generated by an aperiodic set of prototiles named after Sir Roger Penrose, who investigated these sets in the 1970s.
Split into simpler sentences: A Penrose tiling is a non-periodic tiling generated by an aperiodic set of prototiles. They are named for Sir Roger Penrose, who investigated these sets in the 1970s.