Onlookers watch a white stock car that has smoke coming out of the back.
People are looking at a car.
Onlookers are a type of people.  A stock car is a type of car.
exists e1 e3 e2 s1 x1 x2 x3 x4 x5 x6 x7.(n_back(x7) & Theme(e3,x2) & Actor(e3,x1) & v_watch(e3) & Theme(e2,x5) & Actor(e2,x4) & v_have(e2) & r_out(e1) & of(e1,x7) & Actor(e1,x6) & v_come(e1) & (x5 = x6) & n_smoke(x5) & (x2 = x4) & n_car(x2) & of(x2,x3) & n_stock(x3) & a_white(s1) & Theme(s1,x2) & n_onlooker(x1))
exists e1 x1 x2.(at(e1,x2) & n_car(x2) & Actor(e1,x1) & v_look(e1) & n_people(x1))