Complex sentence: The play's longevity has ensured its popularity with tourists from around the world, and in 1997, with producer Stephen Waley-Cohen, it helped spawn a theatrical education charity, Mousetrap Theatre Projects, which helps young people experience London's theatre.
Split into simpler sentences: The play's longevity has ensured its popularity with tourists from around the world. In 1997, at the initiative of producer Stephen Waley-Cohen, the theatrical education charity Mousetrap Theatre Projects was launched, helping young people experience London's theatre.