People stand along the sidewalk watching a bus come their way.
People are observing an approaching vehicle.
People are observing an approaching vehicle as they are on the sidewalk watching the bus.
exists e2 e1 e3 x1 x2 x3 x4 x5 x6.(n_way(x6) & of(x6,x2) & n_thing(x2) & n_sidewalk(x2) & along(e1,x2) & Theme(e3,x4) & Actor(e3,x3) & v_watch(e3) & Theme(e2,x6) & Actor(e2,x5) & v_come(e2) & (x4 = x5) & n_bus(x4) & (x2 = x3) & Actor(e1,x1) & v_stand(e1) & n_people(x1))
exists e2 e1 x1 x2.(Theme(e2,x2) & Actor(e2,x1) & v_observe(e2) & n_vehicle(x2) & Actor(e1,x2) & v_approach(e1) & n_people(x1))