People outside in a city field.
People are in a field.
A city field can be commonly referred to as a field.
exists x1 x2 x3 x4.(a_topic(x1) & in(x2,x3) & n_field(x3) & of(x3,x4) & n_city(x4) & outside(x1,x2) & n_thing(x2) & n_people(x1))
exists p1 x1.(exists x2.(in(x1,x2) & n_field(x2)) & n_people(x1))