it was said that was all that that girl had said.详细介绍下此句型

据说那就是那个女孩所说的一切.
首先主句是it was said,后面跟了一个省略了that宾语从句,即在said和that之间还有一个that.在宾语从句中,主语是that,was是系动词,然后宾语从句中又套了一个表语从句（all that that girl had said),all that就等于what,这里的第二个that是指示代词,意思是“那个”.
所以,it was said翻译为“据说”,that was翻译为“那就是”,all that that girl had said翻译为“那个女孩所说的一切”