求分析英语句子成分。主谓宾定状补。以及这里为什么so because连用？

Question

However,many others fail to do so because the transition from a student to an employee is actually full of challenges.

Answer 1

这是主从复合句。so 是主句中的状语，because 是引导原因状语从句的连词，它们分属不同的意群。具体的语法结构如下：
主句. Many others fail to do so 许多其他人未能这样做成
［主语］many others
［谓语］fail to do
［状语］so（代替上文提到过的事情）
原因状语从句 because the transition from a student to a employee is full of chanllenges 因为从学生到雇员的转换充满了挑战
［主语］ the transition from a student to an employee (from a stundet to an employee 是后置定语)
［谓语动词］is
［表语］full of chanllenges

Answer 2

However, many others fail to do so because the transition from a student to an employee is actually full of challenges.
全句意思是：
然而，许多人未能做到这一点，因为从学生转变到职员实际上充满了挑战。
句子分析：
However, many others主语； fail to do so宾语； because引导原因状语从句； the transition 从句主语；from a student to an employee从句补语； is 从句系动词；actually full of challenges.从句表语。

Answer 3

so adv. （指刚说过的事物）这样，如此
used to refer back to sth that has already been mentioned.

句中，你断句断错了，many others fail to do so// because...（原因状从）
并不是连用，so不是连词，是主句的副词，指代前面的sth；because引导原因状从