Complex sentence: Christie's stage play "The Mousetrap" holds the world record for the longest initial run: it opened at the Ambassadors Theatre in the West End on 25 November 1952 and is still running after more than 25,000 performances.
Split into simpler sentences: Christie's stage play "The Mousetrap" holds the world record for longest initial run. It opened at the Ambassadors Theatre in the West End on 25 November 1952 and is still running after more than 25,000 performances.