Complex sentence: The inexpensive clones succeeded with consumers where IBM had failed two years earlier with the PCjr; unlike the IBM product, they were as fast as or faster than the IBM PC and remained highly compatible so users could bring work home.
Split into simpler sentences: The inexpensive clones succeeded with consumers where IBM had failed two years earlier with the PCjr. Unlike the IBM product, they were as fast as or faster than the IBM PC and remained highly compatible so users could bring work home.