Complex sentence: The park layout differs every year but a miniature half-pipe is always part of the layout.Also set up are: several rails including an A-frame rail and box, 2 or 3 down rails, and 2 small boxes for beginners.
Split into simpler sentences: The park layout differs every year but a miniature half-pipe is always part of the layout. Among the layout are several rails including an A-frame rail and box, 2 or 3 down rails, and 2 small boxes for beginners.