Complex sentence: Her commanding officer used her as a scapegoat for his torture of prisoners, leading her to kill him, and be sentenced to death herself, leaving her open for the chance to be altered by Ryker instead.
Split into simpler sentences: Her commanding officer used her as a scapegoat for his torture of prisoners, leading her to kill him and be sentenced to death herself. This left Rana her open for the chance to be altered by Ryker instead.