Complex sentence: She escaped with a friend to another section of the camp, where she remained through the winter, but died from starvation in January 1945, twenty days before the Red Army liberated the camp, and 10 days before her 45th birthday.
Split into simpler sentences: She escaped with a friend to another section of the camp, where she remained through the winter, but died from starvation in January 1945 at the age of forty-four. Twenty days before the Red Army liberated the camp, and 10 days before her 45th birthday.