Complex sentence: A third version of the game, identical to the Super Nintendo version, was made playable on the Sega Genesis through the Sega Channel subscription service, which allowed subscribers to temporarily download games to their Sega Genesis system for as long as the system was left on.
Split into simpler sentences: A third version of the game was made playable on the Sega Genesis through the Sega Channel subscription service. It allowed subscribers to temporarily download games to their Sega Genesis system for as long as the system was left on.