Complex sentence: Initial plans called for the use of five H8K aircraft, These would fly to Kānemilohai (also known as the French Frigate Shoals) the largest atoll in the Northwestern Hawaiian Islands, 1,900 miles away.
Split into simpler sentences: Initial plans called for the use of five H8K aircraft. They would fly to Kānemilohai (also known as the French Frigate Shoals), the largest atoll in the Northwestern Hawaiian Islands, 1,900 miles away.