Complex sentence: The system is currently fabricated by Painter Brothers, Hereford, operating within the Balfour Beatty Power Networks Division formerly British Insulated Callender's Cables.
Split into simpler sentences: The system is currently fabricated by Painter Brothers, Hereford, operating within the Balfour Beatty Power Networks Division. The former name of Balfour Beatty was British Insulated Callender's Cables.