There are buildings in the background.
The buildings are made of hats
These sentence are two different sentence. Building in the background and made of hats are two different sentence.
exists p1 x1 x3.(n_background(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_building(x2)))
exists e1 x1 x2.(n_building(x1) & of(e1,x2) & n_hat(x2) & Theme(e1,x1) & v_make(e1))