Complex sentence: The DECsystem 5800 Series are high-end multiprocessor systems, and the series was comprised of the DECsystem 5810,5820,5830 and 5840, with the third digit referring to the number of processors.
Split into simpler sentences: The DECsystem 5800 Series are high-end multiprocessor systems. The series comprised the DECsystem 5810,5820,5830, and 5840, with the third digit referring to the number of processors.