In bringing to a close the adventures of my friend Sherlock Holmes I am perforce reminded that he never, save on the occasion which, as you will now hear, brought his singular career to an end, consented to act in any mystery which was concerned with persons who made a livelihood by their pen.
"I am not particular about the people I mix among for business purposes," he would say, "but at literary characters I draw the line."
第一段,译者对句子结构的分析错误,save on the occasion which, as you will now hear, brought his singular career to an end 这些都是插入成分。