Complex sentence: The senior civil servant in a department is usually titled, Deputy Minister (given the title of Deputy Head) and is responsible for the entire workings of the department and reports directly the Minister as well as the Clerk of the Privy Council.
Split into simpler sentences: The senior civil servant in a department is usually titled, Deputy Minister (given the title of Deputy Head). Deputy heads report directly the Minister, as well as the Clerk of the Privy Council.