A man wearing black and white stripes is trying to stop a horse.
The horse has escaped his pen.
Just because the man is trying to stop the horse, it does not mean that  the horse has escaped.
exists e1 e2 p1 s1 s2 x1 x2 x3.(Topic(e2,p1) & Actor(e2,x1) & v_try(e2) & exists e3 x4.(Theme(e3,x4) & Actor(e3,x1) & v_stop(e3) & n_horse(x4)) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_stripe(x3) & a_white(s2) & Theme(s2,x3) & a_black(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_pen(x2) & of(x2,x1) & n_male(x1) & n_horse(x1) & Theme(e1,x2) & Actor(e1,x1) & v_escape(e1))