Question: Sir Frederick William Richards led a huge shipbuilding and naval works programme under a British Conservative statesman who served as prime minister for over how many years?
Sentence (from "Robert Gascoyne-Cecil, 3rd Marquess of Salisbury"): Robert Arthur Talbot Gascoyne-Cecil, 3rd Marquess of Salisbury, {'1': ", '2': ", '3': ", '4': "} (3 February 183022 August 1903), styled Lord Robert Cecil before 1865 and Viscount Cranborne from June 1865 until April 1868, was a British Conservative statesman, serving as prime minister three times for a total of over 13 years.
Relevant evidence: Yes