帮我分析一下这个句子的语法成分
Considering how recent these developments are,it is even more remarkable that as long age as the 1960s,an Englishman,Leon Bagrit,was able to predict some of the uses of computers which we know today.
这句话中一定要详细的分析一下it is even more remarkable that as long age as the 1960s这个分句的成分和结构 尤其是that后面这个状语为什么要用that引导?把that去了不行吗?
还用Considering是不是引导的伴随状语?
提出的问题一定都要回答啊!