Complex sentence: The game was released on five 5.25 "floppy disks and three 3.5" disks, it became Sierra's second largest game, after Time Zone (computer game) (six disks).
Split into simpler sentences: The game was released on five 5.25 "floppy disks and three 3.5" disks. It became Sierra's second largest game after "Time Zone" (six disks).