Complex sentence: Although Junge had reached the Elbe she was unable to reach the western Allied lines, so she went back to Berlin, getting there about a month after she had left, hoping to take a train to the west when they began running again.
Split into simpler sentences: Although Junge had reached the Elbe, she was unable to reach the western Allied lines, and so she went back to Berlin. Getting there about a month after she had left, she had hoped to take a train to the west when they began running again.