Complex sentence: Meanwhile, Arthur Conan Doyle, feeling that Holmes was stifling him and keeping him from more worthy literary work, had finished his "Sherlock Holmes" saga and killed Holmes off in "The Final Problem", published in 1893.
Split into simpler sentences: Meanwhile, Arthur Conan Doyle felt that the character of "Sherlock Holmes" was stifling him and keeping him from more worthy literary work. He had finished his Holmes saga and killed him off in "The Final Problem" published in 1893.