A cowboy riding a horse in a ring.
a cowboy is in a ring
in both sentences, a cowboy is in a ring.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_ring(x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_horse(x3) & (x1 = x2) & n_cowboy(x1))
exists p1 x1.(exists x2.(in(x1,x2) & n_ring(x2)) & n_cowboy(x1))