A motocross racer does a trick in midair.
A racer does a trick in midair.
It was a motocross racer does  a  trick in midair.
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_midair(x4) & Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_trick(x3) & n_racer(x1) & of(x1,x2) & n_motocross(x2))
exists e1 x1 x2 x3.(in(e1,x3) & n_midair(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & n_racer(x1))