Complex sentence: He finished his American Revolution series with "Eagle in the Sky" in 1948, wrote a popular novel about the famous buccaneer, Henry Morgan called "Cutlass Empire" in 1949, and started a trilogy on the Civil War in 1951.
Split into simpler sentences: He finished his American Revolution series with "Eagle in the Sky" in 1948. He wrote "Cutlass Empire", a popular novel about the famous buccaneer Henry Morgan, in 1949, and started a trilogy on the Civil War in 1951.