請幫忙分析這句子的句型結構！謝謝！

Question

Since the beginning of the 1960s, research on language acquisition has been strongly influnced by Chomsky's theory of generative grammar,
and the main problem to which it has addressed itself has been how it is possible for young children to infer the grammatical rules underlying the speech they hear and then to use these rules for the construction of utterances that they have never heard before.

我看不太懂ㄟ！請大家幫忙!!! 大感激！

Answer 1

Since the beginning of the 1960s, research on language acquisition has been strongly influenced by Chomsky's theory of generative grammar,
從1960年代起﹐語言習得的研究就受到 Chomsky “衍生語法”理論的強烈影響﹐
and the main problem (1)[to which it has addressed itself] has been {how it is possible for young children to infer the grammatical rules underlying the speech[*they hear] and then to use these rules for the construction of utterances (that they have never heard before)}.而且主要的疑問﹐[就是研究的核心]﹐一直是﹕{幼兒是如何揣摩出潛藏在[*他們所聽到的]話語之下的文法﹐之後再使用這些語言規則來架構起他們自己的語詞表達﹐(而此語詞是他們未曾聽過的)}。

句子結構分析﹕
這段文字含有兩個對等子句以對等連接詞“and”連接﹔and後面的子句中又包含(1)[....]的形容詞子句用以修飾“main problem”﹐{.....}的子句做為 “has been”的述詞補語﹔在“speech”與“they”之間省略了一個關係代名詞“that”﹐而此“that”所代領的子句用來修飾“speech”﹐另一個由that所代領的子句(.....)則用來修飾“utterances”。