People are riding in a red sightseeing bus.
The bus is showing them the sites of London.
Red sightseeing bus does not necessarily mean in London.
exists e1 s1 x1 x2 x3.(in(e1,x2) & n_bus(x2) & of(x2,x3) & n_sightseeing(x3) & a_red(s1) & Theme(s1,x2) & Actor(e1,x1) & v_ride(e1) & n_people(x1))
exists e1 x1 x2 x3 x4.(n_thing(x4) & ne_geo_london(x3) & n_site(x2) & n_bus(x1) & Recipient(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_show(e1) & of(x2,x3))