A man on horseback, inside a corral, is chasing a steer.
man practices for rodeo
The man doesn't have to be in the process of practices for rodeo.
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_chase(e1) & n_steer(x4) & inside(x1,x3) & n_corral(x3) & on(x1,x2) & n_horseback(x2) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & for(x1,x3) & n_rodeo(x3) & n_practice(x1) & of(x1,x2) & n_man(x2))