Complex sentence: Brent W. Brisben (March 20) is an American treasure hunter best known for salvaging the shipwrecks of the historic 1715 Treasure Fleet, a Spanish treasure fleet returning from the New World to Spain.
Split into simpler sentences: Brent W. Brisben (March 20) is an American treasure hunter best known for salvaging the shipwrecks of the historic 1715 Treasure Fleet. The 1715 Treasure Fleet was a Spanish treasure fleet returning from the New World to Spain.