young boy sitting on a red saddle on a horse.
The boy is riding a horse.
The young boy is sitting on a saddle because he is riding a horse.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_horse(x4) & on(e1,x3) & n_saddle(x3) & a_red(s2) & Theme(s2,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2))