Complex sentence: Dockery was a member of the National Youth Theatre, studied at the Guildhall School of Music and Drama where she won the Gold Medal for Drama and made her professional debut in "His Dark Materials" at the Royal National Theatre in 2004.
Split into simpler sentences: Dockery was a member of the National Youth Theatre and studied at the Guildhall School of Music and Drama, where she won the Gold Medal for Drama. She made her professional debut in "His Dark Materials" at the Royal National Theatre in 2004.