A Motocross rider is midair with dense clouds in the sky.
The man is on a motorcross
Motocross rider is midair simply means man is on a motorcross
exists s1 s2 x1 x2 x3 x4.(n_sky(x4) & with(s1,x3) & in(x3,x4) & n_cloud(x3) & a_dense(s2) & Theme(s2,x3) & Theme(s1,x1) & a_midair(s1) & n_rider(x1) & (x1 = x2) & ne_nam_motocross(x2))
exists p1 x1.(n_man(x1) & exists x2.(on(x1,x2) & n_motorcross(x2)))