Complex sentence: Mirroring a subplot of "Dear Enemy", he had an unhappy marriage to an unstable woman, Annette Reynaud, who was frequently hospitalized for manic-depressive episodes.
Split into simpler sentences: Mirroring a subplot of "Dear Enemy", he had an unhappy marriage due to his wife struggling with manic depression. McKinney's wife, Annette Reynaud, was frequently hospitalized for manic-depressive episodes.