Complex sentence: They remained popular until the introduction of inexpensive graphics workstations in the 1980s, which used raster displays and dedicated screen buffers that became more affordable as solid state memory chips became cheaper.
Split into simpler sentences: They remained popular until the introduction of inexpensive graphics workstations in the 1980s. The new graphics workstations used raster displays and dedicated screen buffers that became more affordable as solid state memory chips became cheaper.