Complex sentence: The unit would be equipped with the new Messerschmitt Bf 109 G-5, a high-altitude variant of the Bf 109 G-6, equipped with a pressurized cockpit and armed with extra underwing cannons or rockets.
Split into simpler sentences: The unit would be equipped with the new Messerschmitt Bf 109 G-5, a high-altitude variant of the Bf 109 G-6. It was equipped with a pressurized cockpit and armed with extra underwing cannons or rockets.