The police arresting someone on a busy city street.
A person got arrested outside.
On the street is outside.  The police are doing the arresting.
exists e1 s1 x1 x2 x3 x4 x5.(n_police(x1) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_arrest(e1) & on(x3,x4) & n_street(x4) & of(x4,x5) & n_city(x5) & a_busy(s1) & Theme(s1,x4) & n_person(x3) & (x1 = x2))
exists e1 p1 x1.(exists e2 s1.(a_outside(s1) & Manner(e2,s1) & Actor(e2,x1) & v_arrest(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & n_person(x1))