Complex sentence: A special version of the TT was designed to be a UNIX station, called TT/X it was supplied with UNIX System V R4 and WISH (an extension of OSF Motif).
Split into simpler sentences: A special version of the TT, the TT/X, was designed to be a UNIX station. It was supplied with UNIX System V R4 and WISH (an extension of OSF Motif).