Complex sentence: Lien moved to New York in 1991 after she was cast in the role of Hannah Moore on the series "Another World" in 1991, where she attended and graduated the Professional Children's School while working on this series.
Split into simpler sentences: Lien moved to New York in 1991 after she was cast as Hannah Moore on the series "Another World". She attended and graduated from the Professional Children's School while working on this series.