Complex sentence: In 1984 the Orca Edge was an early example for an no-decompression computer which was unable to display a decompression plan, but instead the ceiling or the so called save-ascent-depth.
Split into simpler sentences: In 1984 the Orca EDGE was an early example for an no-decompression computer. The EDGE was unable to display a decompression plan, but instead the ceiling or the so called save-ascent-depth.