Complex sentence: Medical research has shown that the practice is ineffective, with a possibility of injury which is relatively low, with a survey of 122 otolaryngologists identifying encountering 21 ear injuries in total over the course of their careers.
Split into simpler sentences: Medical research has shown that the practice is ineffective, with a possibility of injury which is relatively low. A survey of 122 otolaryngologists identifying encountering 21 ear injuries in total over the course of their careers.