Rider riding a white horse that is jumping a fence.
a rider is jumping a fence on a horse
There is a rider jumping a on horse in both examples.
exists e2 e1 s1 x1 x2 x3 x4.(ne_nam_rider(x1) & Theme(e2,x2) & Actor(e2,x1) & v_ride(e2) & Theme(e1,x4) & Actor(e1,x3) & v_jump(e1) & n_fence(x4) & (x2 = x3) & n_horse(x2) & a_white(s1) & Theme(s1,x2))
exists e1 x1 x2 x3.(on(e1,x3) & n_horse(x3) & Theme(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_fence(x2) & n_rider(x1))