原文中的句子，即你所说的句1，存在语法错误。逗号后用and并列一个关系分句（限定分句）和非限定分句，这是原则性的语法错误。正确的结构应该是：..., some of which are mythological and some ( of which are) grounded in truth. 括号内部分可以省略，属于并列句中第二分句的省略，省略部分可以通过第一分句进行还原。但用非限定的being替换are就是语法错误了。
2 主句+定语从句或独立主格的区别
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1） Most countries have a rich heritage of legends and folklore about the birth and development of their nation, some of which are mythological and some being grounded in truth.
2） Most countries have a rich heritage of legends and folklore about the birth and development of their nation，some of which are mythological and others( of which are) grounded in truth.
请教曹老师，原版国外进口教材（封皮如照片所示）雅思范文原句是句1）即：逗号后为定语从句+独立主格。
如果让我写，我能想到的句子是句2）即：逗号后为定语从句+定语从句。
请教曹老师，原文句1 比句2有哪些优势？句子1和句子2语（意）义方面有哪些细微差别？谢谢曹老师。
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