Complex sentence: The Royal Society of Literature comprises up to 500 fellows: they include most of the very best novelists, short-story writers, poets, playwrights, biographers, historians, travel writers, literary critics and scriptwriters at work today.
Split into simpler sentences: The Royal Society of Literature comprises up to 500 fellows. They include most of the best novelists, short-story writers, poets, playwrights, biographers, historians, travel writers, literary critics and scriptwriters at work today.