Complex sentence: The study of psychic phenomena by major scientists started in the mid-nineteenth century; early researchers included Michael Faraday, Alfred Russel Wallace, Rufus Osgood Mason and William Crookes.
Split into simpler sentences: The study of psychic phenomena by major scientists started in the mid-nineteenth century. Early researchers included Michael Faraday, Alfred Russel Wallace, Rufus Osgood Mason, and William Crookes.