Complex sentence: The United States Secretary of Commerce is the head of the United States Department of Commerce concerned with business and industry; the Department states its mission to be "to foster, promote, and develop the foreign and domestic commerce".
Split into simpler sentences: The United States Secretary of Commerce is the head of the United States Department of Commerce. A member of the President's Cabinet, the Secretary is concerned with promoting American businesses and industries; the Department states its mission to be "to foster, promote, and develop the foreign and domestic commerce".