Complex sentence: The above treatment consists of ridding the body of the infection and swelling; however, some practitioners suggest that the immune system is still very weak during lymphangitis, and if not addressed the disease is quite likely to recur.
Split into simpler sentences: The above treatment consists of ridding the body of the infection and swelling. But the immune system is still very weak during lymphangitis, and if not addressed the disease is quite likely to recur.