Complex sentence: The system requirements were rather high for the time; a 486 was the minimum requirement and the Pentium was heavily recommended for smooth gameplay and full graphics detail; many gamers still had 386 processors at the time and as a result the game did not sell well.
Split into simpler sentences: The system requirements were rather high for the time; an 486 was the minimum requirement, and the Pentium was heavily recommended for smooth gameplay and full graphics detail. Many gamers still had the 386 processors at the time, and as a result, the game did not sell well.