Complex sentence: Secretary of the Navy John D. Long cared more for formalities than functions and left major decisions to Roosevelt, who wasted no time and within weeks of his appointment began pressing the president on his national security views in the Pacific and more intently in the Caribbean.
Split into simpler sentences: Secretary of the Navy John D. Long cared more for formalities than functions and left major decisions to Roosevelt. He water no time and within weeks of his appointment began pressing the president on his views of national security in the Pacific and more intently in the Caribbean.