Complex sentence: Dogs have been proven to be able to assist people in overcoming grief, which has led to a recent rise in the use of therapy dogs; although animal-assisted therapy theory has been around since World War II. Woodruff, Racheal.
Split into simpler sentences: Dogs have been proven to be able to assist people in overcoming their grief. This has led to a recent rise in the use of therapy dogs in helping people through the grieving process, although animal-assisted theory having been around since World War II. Woodruff, Racheal.