Complex sentence: The President of the United States Franklin Delano Roosevelt wished to commemorate the loss of the "HMAS Canberra", and he made a special request that an under-construction American heavy cruiser be renamed as a tribute to her.
Split into simpler sentences: The President of the United States, Franklin Delano Roosevelt, wished to commemorate the loss of HMAS "Canberra". He requested than an under-construction American heavy cruiser be renamed as a tribute to her.