Complex sentence: The Saint of Killers was at one time a soldier serving in the Confederate Army during the American Civil War who was simultaneously respected and feared for being absolutely merciless on the battlefield--his bloodlust verged on that of a berserker frenzy.
Split into simpler sentences: The Saint of Killers was at one time a soldier serving in the Confederate Army during the American Civil War. He was simultaneously respected and feared for being absolutely merciless on the battlefield--his bloodlust verged on that of a berserker frenzy.