Complex sentence: A second, 2-acre cemetery was established alongside Rock Island National Cemetery to bury Confederate prisoners of war, nearly two thousand of which would die while in captivity on the island, primarily from the harsh living conditions.
Split into simpler sentences: A second, 2 acre cemetery was established along side Rock Island National Cemetery to bury Confederate prisoners of war. Nearly two thousand of which would die while in captivity on the island, primarily from the harsh living conditions.