Complex sentence: In use it was suspended from a one inch (25mm) cable, and a solid rubber hose carried an electrical supply and telephone wires which were the bathysphere's occupants' only means of communication with the surface.
Split into simpler sentences: In use it was suspended from a one inch (25mm) cable. A solid rubber hose carried an electrical supply and telephone wires which were the bathysphere's occupants' only means of communication with the surface.