帮我分析一个英语句子,帮助我学会模仿如何使用

　　这是一个相当于带有同位语从句的句子.即：This should be a familiar scene in a Hollywood detective movie that an American police officer,armed with a pistol in case of a sudden strke from a misty corner,patrols a dark alley in search of the criminal element.that……引导的从句解释说明a familiar scene的内容.