Complex sentence: The next morning, Holmes goes out to Miss Adler's house dressed as a drunken out-of-work groom and discovers from the local stable workers that Irene Adler has a gentleman friend, the lawyer Godfrey Norton, who calls at least once a day.
Split into simpler sentences: The next morning, Holmes goes out to Adler's house, disguised as a drunken out-of-work groom. He discovers from the local stable workers that Adler has a gentleman friend, the lawyer Godfrey Norton, who calls at least once a day.