BBC news 2010-11-27 加文本

1.A senior member of the Russian parliament described the resolution as a historic document, not just for relations with Poland, but also for Russia itself as it fights what he called the "falsification of history".

not just but also是not only,but also的变形，不仅，而且。这句话的主语和谓语是：A senior member of the Russian parliament described，后面是描述的具体内容。

2.It was only in 1990 that Mikhail Gorbachev admitted the Soviet secret police had been responsible.

It was that强调句型

用“it引导”的强调句，又叫做分裂句，有下面几种情况

1)强调主语，例如：
It was she who had been wrong. 错的是她。
Was it that you broke the window? 是你打破窗户的吗？
But here it’s my word that counts. 但是在这里是我的话算数。

2)强调宾语或介宾
It was the President that Jean shot yesterday. Jean昨天枪击的是总统。
It was to me that she gave the money. 她那钱是给我的。

3)强调状语
It was on Monday night that all this happened. 这一切是发生在星期一晚上。
It was in Beijing that he lived ten years ago. 他十年前是住在北京的。
It was because he was ill that he didn’t go to school. 他是因病而没来上学的。
It was in a different way that they played the game. 他们比赛的方式是不同的。
It was not until 11 o’clock last night that my father returned. 我父亲昨夜直到11点才回来。

3.Around the world, its embassies have been contacting other governments to give advance warning amid concerns that the diplomatic cables contain frank, private opinions and perhaps details of State Department sources within foreign governments.

这句话的主干是：its embassies have been contacting other governments。to give advance warning amid concerns表达目的。that引导的是concerns的同位语从句。