帮我分析一下句子成分！谢谢，急急急！

句子结构：主系表
主语：the reason, 而people trade 是定语，中间省略了that
系动词：is
表语从句：that they believe they will be better off by trading
表语从句中的主语 they，指代people；谓语动词believe；宾语从句 that they will be better off by trading.

regardless of where they live 是插入句

the reason (省略why) perple trade, regardless of where they live, is that they believe they will be better off by trading.

试着翻译成汉语就是：不管身在何方，人们都会从事贸易，因为他们相信这样可以让他们富有起来。

主语是the reason
（why）people trade作为reason的同位语
regardless of where they live整个就是个介词短语，可以作为让步状语
is系动词，后面的that从句是表语从句
其中believe后面的they will be better off by trading.是宾语从句。
不知道这样回答够了没

本人非英语专业人士，如有错误请指正。