Complex sentence: The theatre reopened on 30 November 1982 with a performance of "A Midsummer Night's Dream", featuring a cast from the National Theatre lead by Paul Scofield, which was attended by Princess Margaret, Countess of Snowdon.
Split into simpler sentences: The theatre reopened on 30 November 1982 with a performance of "A Midsummer Night's Dream", featuring a cast from the National Theatre lead by Paul Scofield. The event was attended by Princess Margaret, Countess of Snowdon.