A man listens to his cellphone while watching another man in sunglasses.
A man is using his cellphone.
A man who listens to his cellphone is, it is implied, using his cellphone.
exists e1 e2 x1 x2 x3 x4.(while(e1,e2) & in(e2,x4) & n_sunglass(x4) & Theme(e2,x3) & Actor(e2,x1) & v_watch(e2) & n_man(x3) & -(x3 = x1) & n_man(x1) & n_man(x1) & to(e1,x2) & n_cellphone(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_listen(e1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_cellphone(x2) & of(x2,x1) & n_male(x1) & n_man(x1))