Police on horseback watching the crowd as they move through the streets.
The police are in cars
You cannot be on horseback and in a car at the same time.
exists e1 p1 x1 x2 x3 x4 x5.(n_street(x5) & n_thing(x4) & n_crowd(x4) & a_topic(x1) & exists e2.(through(e2,x5) & Actor(e2,x4) & v_move(e2)) & as(e1,p1) & Theme(e1,x4) & Actor(e1,x3) & v_watch(e1) & (x1 = x3) & on(x1,x2) & n_horseback(x2) & n_police(x1))
exists p1 x1.(n_police(x1) & exists x2.(in(x1,x2) & n_car(x2)))