A man is running behind a dogsled being pulled by four dogs.
A man is running  behind a sled.
The sled that he is running behind is a dogsled.
exists e1 e2 x1 x2 x3 x4.(behind(e1,x2) & Actor(e2,x4) & n_dog(x4) & card_eq_4(x4) & Theme(e2,x3) & v_pull(e2) & (x2 = x3) & n_dogsle(x2) & Actor(e1,x1) & v_run(e1) & n_man(x1))
exists e1 x1 x2.(behind(e1,x2) & n_sled(x2) & Actor(e1,x1) & v_run(e1) & n_man(x1))