A dirty man takes a nap on a public bench.
a man napping on a bench because he is homeless
Not all dirty men are homeless.  A man may nap on a bench for another reason, not because he is homeless.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & on(x2,x3) & n_bench(x3) & a_public(s2) & Theme(s2,x3) & n_nap(x2) & n_man(x1) & a_dirty(s1) & Theme(s1,x1))
exists e1 p1 x1 x2 x3.(a_topic(x1) & exists s1.(Theme(s1,x1) & a_homeless(s1)) & n_male(x1) & because(e1,p1) & on(e1,x3) & n_bench(x3) & Actor(e1,x2) & v_nap(e1) & (x1 = x2) & n_man(x1))