A happy man wearing a hat sits on his horse.
The man sits on a horse.
The man sits on a horse that may be his. Men on horses could also wear a had and be happy
exists e2 e1 s1 x1 x2 x3 x4.(on(e2,x4) & n_horse(x4) & of(x4,x1) & n_male(x1) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_hat(x3) & (x1 = x2) & n_man(x1) & a_happy(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_man(x1) & on(e1,x2) & n_horse(x2) & Actor(e1,x1) & v_sit(e1))