Complex sentence: Under the law at that time, any court martial sentence involving an officer's dismissal in peacetime needed to be confirmed by the President and there was no indication in this order that the conviction was confirmed by President Ulysses S. Grant himself.
Split into simpler sentences: Under the law at that time, any court martial sentence involving an officer's dismissal in peacetime needed to be confirmed by the President. However there was no indication in this order that the conviction was confirmed by President Ulysses S. Grant himself.