Complex sentence: Margery Spring Rice (10 June 1887--21 April 1970), was a British social reformer, Secretary of the League of Nations Society and founding member of the National Birth Control Association (later Family Planning Association).
Split into simpler sentences: Margery Spring Rice (10 June 1887--21 April 1970) was a British social reformer. She was Secretary of the League of Nations Society and a founding member of the National Birth Control Association (later Family Planning Association).