Complex sentence: The Derby Scheme was introduced in autumn 1915 by Edward Stanley, 17th Earl of Derby (1865-1948), who Kitchener appointed Director General of Recruiting, to determine whether British manpower goals could be met by volunteers or if conscription was necessary.
Split into simpler sentences: The Derby Scheme was introduced in autumn 1915 by Edward Stanley, 17th Earl of Derby (1865-1948), who Kitchener had appointed as Director General of Recruiting. It was to determine whether British manpower goals could be met by volunteers or if conscription was necessary.