A man is on the phone in a parking lot.
a man is on the phone
Both sentences state a man is on the phone.
exists p1 x1 x2 x3 x4.(n_phone(x4) & in(p1,x2) & n_lot(x2) & of(x2,x3) & n_parking(x3) & on(x1,x4) & n_man(x1))
exists p1 x1 x2.(n_phone(x2) & on(x1,x2) & n_man(x1))