英语语法，帮我解析一下句子的结构，谢谢

Only gradually was the by product of the institution noted ,and only more gradually still was this effect considerd as a directive factor in the conduct of the institution.

Only gradually was the by product of the institution noted ,and only more gradually still was this effect considerd as a directive factor in the conduct of the institution.
这个句子是倒装句，倒装的原因是否定意义的副词在句首。整个句子是由and连接起来的并列句。整句用被动语态。前半部分的主语部分是the by-product of the institution, 谓语是 was noted; 后半部分的主语部分是this effect, 谓语部分是was considered。only gradually 和 only more gradually still 都是状语。

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