A couple in a parking lot.
A couple are looking for their car.
Sentence 2 explains that the couple are in the parking lot because they are looking for their car.
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_lot(x2) & of(x2,x3) & n_parking(x3) & n_couple(x1))
exists e1 x1 x2.(for(e1,x2) & n_car(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_look(e1) & n_couple(x1))