Complex sentence: The character controlled by the player may move inside the tower and jump from one floor to another, but its movement is limited by the two walls of the tower and the structure of the floors, which it can only penetrate from below.
Split into simpler sentences: The character controlled by the player may move inside the tower and perform jumps from one floor to another. The movement of the character is limited by the two walls of the tower and the structure of the floors, which it can only penetrate from below.