Complex sentence: However, the well known fact that it employed longer but fewer clock cycles, compared to many contemporary CPUs, was due to a more asynchronous design (less subdivision of internal machine cycles) which is similar to early machines, but not to RISC.
Split into simpler sentences: However, the well known fact that it employed longer but fewer clock cycles compared to many contemporary microprocessors was due to a more asynchronous design with less subdivision of internal machine cycles. This is similar to early machines, but not to RISC.