Complex sentence: Each Commando had attached one trained medic, from the Rhodesian Army Medical Corps, who held the rank of Full Corporal and had a much higher standard of medical training than the norm--they were able to prescribe painkillers (like Propon) and also stitch.
Split into simpler sentences: Each Commando had attached one trained medic, from the Rhodesian Army Medical Corps. They were able to prescribe painkillers (like Propon) and also stitch.