A cowboy is riding a horse whilst spinning a lasso around.
The cowboy is using a lasso.
Both sentence are talking about cowboy and lasso.
exists e1 e2 s1 x1 x2 x3 x4.(for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_spin(e2) & n_lasso(x4) & a_around(s1) & Theme(s1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_whilst(x2) & of(x2,x3) & n_horse(x3) & n_cowboy(x1))
exists e1 x1 x2.(n_cowboy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_lasso(x2))