Question

It' an old saying that"It is not that you say but what you say it what matters."

句子成分分析

Answer 1

首先，你这句话不准确，应该是：It' an old saying that"It is not what you say but how you say it that matters." 意思是：俗话说，重要的是怎么说，而非说什么。
其次，这是一句多重复合句。
1. 主体是同位语从句，主句It' an old saying，从句that"It is not what you say but how you say it that matters."
2. 从句其实是强调句，强调的部分是not what you say but how you say it
3. 强调的部分又是由并列的两句主语从句not what you say和 but how you say it 组成的，它们共同的谓语动词是matters.

Answer 2

应该是It is not what you say but how you say it that matters.首先这个句子是个同位语从句，先行词为the saying，也就是这句解释说明the saying。
分析It is not what you say but how you say it that matters，是 not what you say but how you say it matters 对not what you say but how you say it 部分强调的强调句。
not what you say but how you say it matters 中not what you say but how you say it 是主语，意为：不是你说的内容而是你说话的方式。
matters谓语，意为：最主要。
所以，整句翻译为：有一句古谚语：并不是你说话的内容而是你说话的方式，最重要、有关系。
不懂追问。