The minister has since been replaced.

1。这是一个简单句。该句采用了现在完成时。主语是The minister,系表结构be replaced。since为副词,在句中作时间状语,意思是“自那以来/以后”。2。可以把句子换写成：The minister has been replaced since。= The minister has been replaced ever since。= The minister has been replaced since then。翻译：从那以后这个部长/大臣/牧师就被撤换了。