Complex sentence: The alien autopsy was a hoaxed medical examination and dissection of a dummy depicted in a 17-minute black and white film released in 1995 by London-based entrepreneur Ray Santilli.
Split into simpler sentences: The alien autopsy is a 17-minute black and white film released in 1995 depicting a medical examination or autopsy. It was released in 1995 by London-based entrepreneur Ray Santilli.