A young boy in an orange shirt is smiling as he runs in a city scene.
A boy is acting in a commercial for the city.
Sentence 1 does not tell you that the boy is acting or that he is doing a commercial.
exists e1 p1 s1 x1 x2 x3.(exists e2 x4 x5.(in(e2,x4) & n_scene(x4) & of(x4,x5) & n_city(x5) & Actor(e2,x1) & v_run(e2)) & n_male(x1) & as(e1,p1) & Actor(e1,x1) & v_smile(e1) & in(x1,x2) & n_shirt(x2) & of(x2,x3) & n_orange(x3) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_city(x3) & in(e1,x2) & for(x2,x3) & n_commercial(x2) & Actor(e1,x1) & v_act(e1) & n_boy(x1))