Complex sentence: At the age of thirteen she moved to Berlin, and by eighteen she made her debut with the Berlin Philharmonic; however, she returned to Poland almost immediately due to the death of her mother, and married lawyer Julius Hubler, who disapproved of her performing.
Split into simpler sentences: At the age of thirteen she moved to Berlin, and by eighteen she made her debut with the Berlin Philharmonic. However, she returned to Poland almost immediately due to the death of her mother, and married lawyer Julius Hubler, who disapproved of her performing.