首先，我提示一下：

这个问题，你怎么这样提问呢？把for there 放到read 短语中，那么，后面的is 怎么处理？好端端的一个句子被你问的不像个句子了。

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First, we get a strong sense impression as we read him along for there is musicality in almost every line of his prose.

【翻译】首先，当我们不断地读着他的作品的时候，我们就会得到一个强烈的感官印象，因为几乎在他散文的每一行里都有乐感。

【分析】

1. we get a strong sense impression：第一分句。

as we read him along：时间状语从句，修饰第一分句。

read him along 的意思是：keep on reading his works

2.  for there is musicality in almost every line of his prose：表示原因的并列分句。