Complex sentence: His cruise to Australia occurred early in his boxing career, around 1907--08, and coincided with the Cruise of the Great White Fleet, a worldwide Naval cruise of sixteen battleships with white painted hulls intended by President Theodore Roosevelt to demonstrate both strength and diplomacy.
Split into simpler sentences: His cruise to Australia occurred early in his boxing career, around 1907--08 as part of the Cruise of the Great White Fleet. The Cruise included sixteen battleships with white painted hulls and was intended by President Theodore Roosevelt to demonstrate both strength and diplomacy.