Young children on a sled are being pulled through the snow.
some children are playing in the snow
in the snow is a variation of through the  snow.
exists e1 s1 x1 x2 x3.(n_snow(x3) & through(e1,x3) & Theme(e1,x1) & v_pull(e1) & on(x1,x2) & n_sled(x2) & n_child(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_snow(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))