It's amazing what a man will do just for his daughter.

It's amazing what a man will do just for his daughter.
It's amazing what a man will do just for his daughter.

It's amazing what a man will do just for his daughter.
一个人能为自己的女儿做什么真是令人惊讶.
意思是说,为了女儿,一个男人（父亲）什么都做得出.
没有上下文,不知道具体的情况.
这里it's amazing的it是代词,代替后面的句子what a man will do just for his daughter

That's perfectly natural normal.....

爸爸为女儿所做的一切--感天动地！