Complex sentence: As many as 700 prisoners died in 1862 when smallpox and other diseases were rampant in the camp, many aggravated or worsened by the poor living conditions the prisoners endured there, and they were interred in the cemetery in their own Confederate section.
Split into simpler sentences: As many as 700 prisoners died in 1862 when smallpox and other diseases were rampant in the camp. The situation was aggravated by the poor living conditions the prisoners endured there, and they were interred in the cemetery in their own Confederate section.