Complex sentence: She is reunited with Sandra when she asks for her help to choose a care home to stay in, due to her recent battle with Ménière's disease, however, the decision uncovers a murder which prevents Grace from moving into her desired home.
Split into simpler sentences: She is reunited with Sandra when she asks her to help choose a care home, due to her recent battle with Ménière's disease. Their decision uncovers a murder which prevents Grace from moving into her desired home.