分析此英文句的句子成分。

It主's 谓the answer 表 （主句）
同位语从句that led those
定语从句
who have been told for so long by so many to be cynical,and fearful ,and doubtful of
宾语从句what we can achieve to put their hands on the arc of history and bend it once more toward the hope of a better day.

主语It
系动词is
表语the answer
修饰the answer的定语从句that led those who have been told for so long by so many to be cynical,and fearful ,and doubtful of what we can achieve to put their hands on the arc of history and bend it once more toward the hope of a better day

It's the answer是表强调，强调这个answer，后面跟的从句（后面所有的）来修饰answer，“who have been told for so long by so many”是修饰“those”的，后面的and之类的是并列关系