Complex sentence: She has a friend, Mrs Emmeline Clegg, who is a widow who is comfortably off and who in her loneliness has found comfort in a religious sect called "The Flock of the Shepherd" who are based in a retreat in Devon.
Split into simpler sentences: She has a friend, Mrs Emmeline Clegg, s a widow who is comfortably off. In her loneliness, Mrs Clegg has found comfort in a religious sect called "The Flock of the Shepherd", based in a retreat in Devon.