Complex sentence: It had one megabyte of battery-backed RAM, optionally expandable to two, ran MS-DOS from ROM, had a 640x200 pixel resolution LCD and CGA and composite monochrome outputs.
Split into simpler sentences: It had one megabyte of battery-backed RAM, optionally expandable to two. It ran MS-DOS from ROM, had a 640x200 LCD and CGA and composite monochrome outputs.