Complex sentence: Some authors have argued that he was the serial killer known as Jack the Ripper, however, contemporary documents show that Albert Victor could not have been in London at the time of the murders, and the claim is widely dismissed.
Split into simpler sentences: Some authors have argued that he was the serial killer known as Jack the Ripper. Contemporary documents indicate that Albert Victor could not have been in London at the time of the murders, however, and the claim is widely dismissed.