A rider of a dirt bike is midair.
A dirt bike rider is midair.
A rider of a dirt bike is midair is a rephrasing of A dirt bike rider is midair.
exists p1 x1 x2 x3.(exists x4.((x1 = x4) & n_midair(x4)) & of(x1,x2) & n_bike(x2) & of(x2,x3) & n_dirt(x3) & n_rider(x1))
exists p1 x1 x2 x3.(exists x4.((x1 = x4) & n_midair(x4)) & n_rider(x1) & of(x1,x3) & n_bike(x3) & of(x1,x2) & n_dirt(x2))