It would have been better to let one director have this way.

这无疑是个虚拟语气句，是与过去事实不符或相反的虚拟语气。但这是一个单句，不是复合句，因为没有从句。

划线部分是动词不定式，也是句子的主语，暗示着一个“条件”。这就是所谓的“含蓄条件”。

意思是：（过去/之前）要是让一个导演那样做就更好了。

在含有if 条件句的复合句中，一般通过主、从句的谓语动词形式，即可判断出是否用了“虚拟语气”。但很多情况下，虚拟的条件并不是直接通过条件句来表示，而是用一些词、短语或其他连词，甚至通过上下文的暗示，这就是所谓的含蓄条件。有时候还有更含蓄的，句子主语本身就是一种含蓄条件。例如本句。

含蓄条件句举例并分析：

Without air，there wouldn't be living things in the world.

→If there were no air，...没有空气，世界上就没有生物。

She would have come to see you，but she was so busy that day.

→If she had not been so busy that day，she would have come to see you.

她本来会来看你的，可是那天她实在太忙了。

Such mistakes could have been avoided.

→If we had been more careful,such mistakes could have been avoided.

（如果我们再仔细一些）这样的错误本来是能够避免的。

But for your advice，I would have failed.

→If you hadn't given me advice，I would have failed.如果不是你的建议，我会失败的。

He came to town yesterday，otherwise/or I would not have met him.

→If he hadn't come to town yesterday,I would not have met him.

他昨天到城里来了，不然我就不会遇见他了。

You would be a fool to refuse his offer.

→If you should refuse his offer, you would be a fool.

 你要是拒绝他的提议，就太傻了。

Any thinking person would not accept such a condition.

任何一个有思想的人都不会接受这个条件。

→If he were a thinking person, he would not accept such a condition.

A wiser man would not have done such a foolish thing.

聪明一点的人是不会干出这等蠢事的。

→If he had been a wiser man, he would not have done such a foolish thing.