Complex sentence: He was a founder member of the Hampshire Society for Psychical Research in 1889 and joined the London-based Society for Psychical Research in 1893, joining Sir Sidney Scott and Frank Podmore on a poltergeist investigation in Devon in 1894.
Split into simpler sentences: He was a founder member of the Hampshire Society for Psychical Research in 1889 and joined the London-based Society for Psychical Research in 1893. He joined Sir Sidney Scott and Frank Podmore on a poltergeist investigation in Devon in 1894.