Complex sentence: It was prohibitively expensive to replicate, so an RCA Mark III, though conceived of by Belar and Olsen, was never constructed, nor was RCA long for the synthesizer business, promping Columbia to purchase enough spare parts to build two duplicate synthesizers.
Split into simpler sentences: It was prohibitively expensive to replicate, and an RCA Mark III, though conceived of by Belar and Olsen, was never constructed. Nor was RCA long for the synthesizer business, promping Columbia to purchase enough spare parts to build two duplicate synthesizers.