Two children sled down a hill on a plastic discs often referred to as "saucers".
The kids are sledding.
Two children can be rephased kids as part of their description sledding down a hill.
exists e1 e2 s1 s2 s3 s4 x1 x2 x3 x4 x5.(a_down(s4) & Manner(e2,s4) & Theme(e2,x2) & Actor(e2,x1) & v_sled(e2) & on(x2,x3) & a_often(s3) & Manner(e1,s3) & to(e1,x5) & n_saucer(x5) & a_as(s2) & Theme(s2,x5) & Actor(e1,x4) & v_refer(e1) & (x3 = x4) & n_disc(x3) & a_plastic(s1) & Theme(s1,x3) & n_hill(x2) & n_child(x1) & card_eq_2(x1))
exists e1 x1.(n_kid(x1) & Actor(e1,x1) & v_sled(e1))