Complex sentence: There are a number of different psychotherapies for depression which are provided to individuals or groups by psychotherapists, psychiatrists, psychologists, clinical social workers, counselors or psychiatric nurses.
Split into simpler sentences: There are a number of different psychotherapies for depression, which may be provided to individuals or groups. Psychotherapy can be delivered by a variety of mental health professionals, including psychotherapists, psychiatrists, psychologists, clinical social workers, counselors, and psychiatric nurses.