Generate a more complex version of this sentence The ring of steel is the popular name for the security and surveillance cordon consisting of several hundred CCTV cameras surrounding the City of London, the financial district at the heart of Greater London. (Generate versi sing luwih rumit saka ukara iki) The ring of steel iku jeneng umum kanggo kordon keamanan lan pengawasan sing dumadi saka atusan kamera CCTV sing ngubengi City of London, distrik finansial ing jantung Greater London.
Mesthi, versi sing luwih rumit saka ukara kasebut yaiku "Cincin baja minangka jeneng populer kanggo keamanan lan pengawasan keamanan sing kasusun saka sawetara atus kamera CCTV sing ngubengi Kutha London, sing dipasang ing taun 1990an kanggo nyegah IRA Sementara lan ancaman liyane. "