Complex sentence: The memory in these machines is simply one fast pool (2,1 GB/s per second in 1996) shared between system and graphics is done on demand including pointer redirection communication between main system and graphics subsystem.
Split into simpler sentences: The memory in these machines is simply one fast pool (2,1 GB/s per second in 1996) shared between system and graphics. Sharing is performed on demand, including pointer redirection communication between main system and graphics subsystem.