Complex sentence: Orthodontic treatment, as described earlier, is sometimes listed as a possible predisposing factor in the development of TMD, however, orthodontic treatment is also often carried out in the belief that it may treat or prevent TMD.
Split into simpler sentences: Orthodontic treatment, as described earlier, is sometimes listed as a possible predisposing factor in the development of TMD. In addition, orthodontic treatment is also often carried out in the belief that it may treat or prevent TMD.