Original sentence: John Ambulance, which have been providing emergency medical cover in the UK for many years, including active service in both World Wars (pre-dating the existence of any government organised service)
Edited sentence: John Ambulance, which have been providing emergency medical cover in the UK for many years, including active service in both World Wars (pre-dating the existence of any government organised service), and along with St Andrews Ambulance (now St Andrews First Aid, which no longer provides an ambulance service]]) ran statutory ambulance services in the United Kingdom under contract to the government until a reorganisation in 1974