Complex sentence: In general, it is the social model, rather, or in addition to, the dominant medical model, that is the underlying rationale for mental health social work, including a focus on social causation, labeling, critical theory and social constructivism.
Split into simpler sentences: In general, it is the social model rather than, or in addition to, the dominant medical model, that is the underlying rationale for mental health social work. This may include a focus on social causation, labeling, critical theory and social constructivism.