一个主语从句语法分析：It is rare that calls for worksplace flexibility

一个主语从句语法分析：
It is rare that calls for worksplace flexibility are considered to be for men as much as for women.
这个句子的语法成分,帮我分析下.我头疼.
are considered to be for men as much as for women
为什么这里有个to be ..
从句：calls for worksplace flexibility are considered to be for men as much as for women
从句得主语是什么?
That consider to calls for workplace flexibility
be for men as much as for women
is rare.
句子整理可以成这样么?