A man in a blue hat is driving a blue car.
A man is driving a car
A man could be wearing a blue hat.  A car can be blue.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_drive(e1) & n_car(x3) & a_blue(s2) & Theme(s2,x3) & in(x1,x2) & n_hat(x2) & a_blue(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_car(x2) & n_man(x1))