Complex sentence: She undergoes hellish conditions at the camp, but survives long enough to see the end of the war; she makes her way to Vianne, and they reconcile and read their father's last letter to them before Isabelle dies from her mistreatment.
Split into simpler sentences: She undergoes hellish conditions at the camp, but survives long enough to see the end of the war. She makes her way to Vianne, and they reconcile and read their father's last letter to them before Isabelle dies from her mistreatment.