Complex sentence: The average size of maps in the game currently range from approximately 100km x 100km to 200km x 200km, although the engine powering the game is likely to archive larger map sizes in the future.
Split into simpler sentences: The average size of maps in the game, currently range from approx, 100km x 100km to 200km x 200km. Although the engine powering the game is likely to archive larger map sizes in the future.