A man in a costume entertains four kids.
A clown performs for birthday party.
Not all men are a clown.  Entertaining kids does not imply it is for a children's birthday party.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_entertain(e1) & n_kid(x3) & card_eq_4(x3) & in(x1,x2) & n_costume(x2) & n_man(x1))
exists s1 x1 x2 x3.(a_topic(x1) & for(x1,x2) & n_party(x2) & of(x2,x3) & n_birthday(x3) & n_perform(x1) & a_clown(s1) & Theme(s1,x1))