Complex sentence: Under Secretary for Economic, Business, and Agricultural Affairs is a position within the American Department of State that serves as senior economic advisor at the Department and advises the Secretary of State on international economic policy.
Split into simpler sentences: Under Secretary for Economic, Business, and Agricultural Affairs is a undersecretary position within the United States Department of State. The Under Secretary for Economic, Business, and Agricultural Affairs serves as senior economic advisor at the State Department and advises the Secretary of State on international economic policy.