Complex sentence: During the War of 1812, James DeWolf fitted out privateers under the authority of the president of the United States, and one of his ships, the Yankee, became the most successful privateer of the war.
Split into simpler sentences: During the War of 1812, DeWolf fitted out privateers under the authority of the President of the United States. One of his ships, the "Yankee", became the most successful privateer of the war.