Complex sentence: Spirit duplicator technology gradually fell into disuse starting in the 1970s after the availability of low-cost, high-volume xerographic copiers; by the mid 1990s, the use of the technology was rare.
Split into simpler sentences: Spirit duplicator technology gradually fell into disuse starting in the 1970s after the availability of low-cost, high-volume xerographic copiers. By the mid 1990s, the use of the technology was rare.