Dirt bikers traverse a series of jumps.
dirt bikers are performing jumps
Dirt bikers that "traverse a series of jumps" is performing jumps.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_traverse(e1) & of(x3,x4) & n_jump(x4) & n_series(x3) & n_biker(x1) & (x1 = x2) & ne_nam_dirt(x2))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_jump(x3) & n_biker(x1) & of(x1,x2) & n_dirt(x2))