Complex sentence: Alan Louis Charles Bullock, Baron Bullock (13 December 1914--2 February 2004) was a British historian, who is best known for his book', published in 1952 was the first comprehensive biography of Adolf Hitler which influenced many other major biographies of Hitler.
Split into simpler sentences: Alan Louis Charles Bullock, Baron Bullock (13 December 1914--2 February 2004) was a British historian, who is best known for his book'. The book, published in 1952, was the first comprehensive biography of Adolf Hitler and influenced many other major biographies of Hitler.