Two men with children on their shoulders.
two men and their sons
Sentence two may be talking about different men.
exists x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_shoulder(x3) & of(x3,x1) & n_thing(x1) & with(x1,x2) & n_child(x2) & n_man(x1) & card_eq_2(x1))
exists s1 x1 x2.(a_topic(s1) & subset_of(x2,s1) & n_son(x2) & of(x2,x1) & n_thing(x1) & subset_of(x1,s1) & n_man(x1) & card_eq_2(x1))