高手帮忙分析下句子成分

There 是引导词 不作句子成分。
was是不及物动词 作谓语。
a very interesting remark是主语。
in a book by an
Englishman that I read recently是定语。
后面是现在分词短语作定语修饰 remark。
giving是现在分词， 后面是省略that的宾语从句。
what he thought是宾语从句中的主语 ，是主语从句。
was a reason 。。。。。。是宾语从句中的谓语。

你的分析 基本 是正确的。

你好：为你提供精确解答

以上分析都没错。
what he thought was a reason for this American characteristic.这是一个宾语从句,
然后，what（ he thought ）在从句里充当主语。

谢谢，不懂可追问~~~~

There was a very interesting remark是主干部分，
a book by an Englishman that I read recently是介词短语作定语修饰remark
giving what he thought was a reason for this American characteristic.是现在分词短语，作定语，修饰remark
what he thought was a reason for this American characteristic.做现在分词giving的宾语