我在复习英语的过程中，遇到了一个让人迷惑的句子，如果您能帮我解答，在下将感激不尽！
原文如下：
The differences in relative growth of
various areas of scientific research have
several causes.
Some of these causes are completely
reasonable results of social needs.
①Some, however, are less reasonable
processes of different growth in which
preconceptions of the form scientific
theory ought to take, by persons in
authority, act to alter the growth pattern
of different areas.
划线的句子①，我对它的句子结构不明白，我把它改成了句子②：
②Some, however, are less reasonable
processes of different growth in the
preconceptions, which act to alter the
growth pattern of different areas, of
which the form scientific theory ought to
take, by persons in authority.
Question A：句子①和句子②，两者表达的意义完全一样么？
Question B：“by persons in authority” 修饰句子中的哪个部分？
Question C：您能帮我详细分析一下句子①的结构么？
例如：“which preconceptions of the form
scientific theory ought to take, by persons
in authority,” is a Subject Clause, etc.