Complex sentence: At the end of 1919 Albert got his terminally ill mother out of the sanatorium in Luzern and took her to his and his second wife Elsa to Haberlandstrasse 5, Berlin where she died a few months later on February 20,1920.
Split into simpler sentences: At the end of 1919 Albert took his terminally ill mother out of the sanatorium in Luzern and brought her to Haberlandstrasse 5, Berlin to stay with him and his second wife Elsa. There Pauline died a few months later on February 20,1920.