Complex sentence: In the present, Holmes realizes that Watson's fictional embellishments of his last case was a sort of kindness towards Mr. Kelmot, so Holmes writes a letter to Umezaki claiming that his father actually worked secretly for the British Empire and was a brave, honorable man.
Split into simpler sentences: In the present, Holmes realizes that Watson's fictional embellishments of his last case was a sort of kindness towards Mr. Kelmot. So Holmes writes a letter to Umezaki claiming that his father actually worked secretly for the British Empire and was a brave, honorable man.