请教两个句子 1、This success, coupled with later research showing that memory itself is n

请教两个句子
1、This success, coupled with later research showing that memory itself is not genetically determined…
2、But the idea that the journalist must understand the law more profoundly than an ordinary citizen rests on an understanding of the established conventions and special responsibilities of the new media.
请问第一句中为什么showing的主语是"later research"而不是"This succeeds"和"later research"？
第二句中为什么后半句翻译为"建立在对新闻媒体已有习俗和特殊责任的了解上"，而不是"建立在对已有习俗和新闻媒体特殊责任的了解上"？
表述的可能有点混乱，希望大神能给解答下，感激不尽!

1showing...是现在分词短语作后置定语 与所修饰词有逻辑上的主谓关系。
2因为最后一个of短语修饰的是前面的the established conventions and special responsibilities

This success, coupled with later research showing that memory itself is not genetically determined 翻译结果： 这一成功,加上后来的研究表明记忆本身并不是基因决定的 再看看别人怎么说的。

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