Complex sentence: Dr. Ray Neff, a retired health sciences professor at Indiana State University with a chemistry background, was a leading proponent of an alternative history theory about the assassination of Abraham Lincoln and his killer John Wilkes Booth.
Split into simpler sentences: Dr. Ray Neff was a health sciences professor at Indiana State University with a chemistry background. He was a leading proponent of an alternative history theory about the assassination of Abraham Lincoln and his killer John Wilkes Booth.