Complex sentence: Only MU6-P and a mid-range processor, MU6-G, were ever produced, and ran between 1982 and 1987, but the university did not have the resources to build the remaining machines in-house and the system was never commercially developed.
Split into simpler sentences: Only MU6-P and a mid-range processor, MU6-G, were ever produced, and ran between 1982 and 1987. The university did not have the resources to build the remaining machines in-house, and the system was never commercially developed.