People on a bridge look at the water.
People are on a bridge.
People on a bridge that look at water, are still people on a bridge.
exists x1 x2 x3 x4.(n_water(x4) & a_topic(x1) & on(x1,x2) & at(x2,x4) & n_look(x2) & of(x2,x3) & n_bridge(x3) & n_people(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_bridge(x2)) & n_people(x1))