Complex sentence: In 1967 at the request of Charles Reno, the Major's great-nephew, a US military review board reviewed the original documents and testimony of Reno's 1880 court martial and reversed the decision, ruling Reno's dismissal from the service improper.
Split into simpler sentences: In 1967 at the request of Charles Reno, the Major's great-nephew, a US military review board reviewed the original documents and testimony of Reno's 1880 court martial. It reversed the decision, ruling Reno's dismissal from the service improper.