Complex sentence: The game's world exists in a continual 24-hour world that never stop; progress in the game continue even when the player is away, and the game's artificial intelligence will take over defending a province when the player is not present.
Split into simpler sentences: The game's world exists in a continual 24-hour world that never stops; progress in the game continues even when the player is away. Artificial intelligence will take over and defend a province when the player is not present.