The guy on the bicycle is doing a very high jump on a track.
A bicyclist performs a difficult trick.
A very high jump on a track on a bicycle need not be a difficult trick.
exists e1 s1 x1 x2 x3 x4.(n_bicycle(x2) & n_guy(x1) & Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & on(x3,x4) & n_track(x4) & n_jump(x3) & a_high(s1) & Theme(s1,x3) & r_very(x3) & on(x1,x2))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & a_difficult(s1) & Theme(s1,x2) & n_bicyclist(x1))