看看这句话有没有语法错误

And  then  I  want  to read a poem to you which is witten by Calvin Coolidge, who is the 30^th president in the history of America.

我想表达的意思是 ：然后，我想给你们读一首美国历史上第三十任总统柯立芝写的诗。

After that,  I  want  to read a poem composed by Calvin Coolidge, the 30^th president of the United States.

 

你的原文有点罗嗦，

一、which 应该紧跟poem，所以主句应为I want to read you a poem which........

二、which is written应为which was written

三、who is the 30th应为who was the 30th.

没有什么语法错误

因为不是非限制性定语从句，所以把前面这句中的which改成what，作从句主语

能理解，没什么语法错误

你写的句子，没有什么大的语法错误，懂英语的人可以很容易看懂句意，但是定语从句的话尽量避免在一句话中这样重复使用，我们的本意也就是让别人很容易理解我们的意思，我建议可以使用如下：I want to read a poem for you, which is witten by Calvin Coolidge, the 30th president in the history of America.（ 结构大概是：主句+定语从句+同谓语），希望可以帮到你~~~