Complex sentence: During this period, Canby crossed paths with Captain Henry Hopkins Sibley (whom he may have known slightly at West Point) when the captain was court martialed and Canby served on the panel of judges.
Split into simpler sentences: During this period, Canby crossed paths with Captain Henry Hopkins Sibley, whom he may have known slightly at West Point. Sibley was court martialed and Canby served on the panel of judges.