Complex sentence: In 1843 he heard lectures in Poughkeepsie on animal magnetism, as the phenomena of hypnotism was then termed, and found that he had remarkable clairvoyant powers; and in the following year he had, he said, spiritual messages telling him of his life work.
Split into simpler sentences: In 1843 he heard lectures in Poughkeepsie on animal magnetism, as the phenomena of hypnotism was then termed, and found that he had remarkable clairvoyant powers. In the following year he had, he said, spiritual messages telling him of his life work.