Complex sentence: The parents are disgusted and yet erotically stimulated by the images which we assume to be pornographic--when we see the images, they are revealed as picture postcards of architecture (there is a satirical nod towards Freudian symbolism in the images of tunnels and columns).
Split into simpler sentences: The parents are disgusted and yet erotically stimulated by the images which we assume to be pornographic. When we see the images, they are revealed as picture postcards of architecture (there is a satirical nod towards Freudian symbolism in the images of tunnels and columns).