Complex sentence: McDougall underwent psychoanalysis with C. G. Jung, and was also prepared to study parapsychology; in 1920 he served as president of the Society for Psychical Research, and in the subsequent year of its US counterpart, the American Society for Psychical Research.
Split into simpler sentences: McDougall underwent psychoanalysis with C. G. Jung, and was also prepared to study parapsychology. In 1920 he served as president of the Society for Psychical Research, and in the subsequent year of its US counterpart, the American Society for Psychical Research.