Complex sentence: In the early twentieth century, photographs claiming to show ectoplasm were occasionally published; these were largely shown to be fraudulent, although numerous studies in the 1950s and 60s have claimed to confirm the existence of ectoplasm.
Split into simpler sentences: In the early twentieth century, photographs claiming to show ectoplasm were occasionally published; these were largely shown to be fraudulent. Numerous studies in the 1950s and 60s have claimed to confirm the existence of ectoplasm.