Complex sentence: The PERQ design was influenced by the original workstation computer, the Xerox Alto, and was the first commercially produced personal workstation, a prototype being shown at the 1979 SIGGRAPH conference.
Split into simpler sentences: The PERQ design was influenced by the original workstation computer, the Xerox Alto. It was the first commercially-produced personal workstation, a prototype of which was shown at the 1979 SIGGRAPH conference.