Complex sentence: In a common coaxial configuration, the dielectric is shaped in the same form as common fluorescent tubing, filled at atmospheric pressure with either a rare gas or rare gas-halide mix, with the glass walls acting as the dielectric barrier.
Split into simpler sentences: In a common coaxial configuration, the dielectric is shaped in the same form as common fluorescent tubing. It is filled at atmospheric pressure with either a rare gas or rare gas-halide mix, with the glass walls acting as the dielectric barrier.