A man wearing a hat is standing on a machine that is being pulled by horses.
A man wearing a hat is commanding horses to pull him.
Just because the horses are pulling does not mean someone is commanding them.
exists e2 e3 e1 x1 x2 x3 x4 x5 x6.(on(e2,x4) & Actor(e3,x6) & n_horse(x6) & Theme(e3,x5) & v_pull(e3) & (x4 = x5) & n_machine(x4) & Actor(e2,x1) & v_stand(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_hat(x3) & (x1 = x2) & n_man(x1))
exists e1 p1 x1 x2 x3.(exists p2 s1 x4.((x1 = x4) & Topic(x4,p2) & exists e2.(Theme(e2,x1) & Actor(e2,x4) & v_pull(e2)) & n_horse(x4) & a_commanding(s1) & Theme(s1,x4)) & n_male(x1) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_hat(x3) & (x1 = x2) & n_man(x1))