英语句子分析？？

Question

its corporate culture was too rooted in the successes of the past for it to make the clean break necessary to fully embrace the future.
请问这个句子for it是什么成分，怎么翻译？

Answer 1

its corporate culture was too rooted in the successes of the past for it to make the clean break necessary to fully embrace the future.它的企业文化太过于强调过去的成功，因此它无法做出彻底的突破来充分拥抱未来。

追问

for it是什么成分

追答

for it to do sth 不定式复合结构，引出不定短语（to make the clean break）的主体
类似于：
It's time to eat——
It's time for us （引出不定式短语的主体）to eat.
不知道我的理解对不对，你参考一下

Answer 2

1.which引导的非限制性定语从句，which后面的部分修饰先行词letter，主句是逗号之前的部分；
2.前面是强调句型，此句是when和that引导的复合定语从句.when之后that之前共同修饰letter.
3.who引导的限制性定语从句，who之后修饰先行词people.who之前为主句之后为从句。
4.why引导的原因状语从句，why...修饰understand.