Complex sentence: The Japanese whaling industry quickly recovered as MacArthur authorized two tankers, converted into factory ships ("Hashidate Maru " and"Nisshin Maru"), with whale catchers to once again take blue whales, fins, humpbacks and sperm whales in the Antarctic and elsewhere.
Split into simpler sentences: The Japanese whaling industry quickly recovered as MacArthur authorized two tankers to be converted into factory ships ("Hashidate Maru " and"Nisshin Maru"). Whale catchers once again took blue whales, fins, humpbacks and sperm whales in the Antarctic and elsewhere.