自建室内小生态系统:You know many ladies look at many hats before they buy on and this makes salesmen very tired

不是的
and连接的是many ladies look at many hats before they buy one和 this makes salesmen very tired两个句子.
before they buy it是前一句的状语

不连在一起解释。

这句话要分两句翻译。
You know many ladies look at many hats before they buy one 这是第一句。
意思是女士们买帽子之前总是要挑选很多来看。
and this makes salesmen very tired
这句中的this就是指女士们买帽子之前总是要挑选很多来看这件事，and做连词，连接这两个意思，后面的意思是，这件事使售货员很厌烦。

(你也该知道),许多女士在买帽子之前总是看很多并且这使售货员很倦累
You know , many ladies ,before they buy one , look at many hats , and this makes salesmen very tired
这个顺序可以
这种时间 之前之后的,依语境应提前,从同开始,一步一个脚印的整吧

不用,BEFORE应翻译在前面,译句同楼上

你知道,许多女士在买一顶帽子之前要看很多的帽子,这使得售货员非常厌倦.
这是我的翻译.
翻译时,把you know先扔了,many ladies look at many hats before they buy one和this makes salesmen very tired 并列.

"You know many ladies look at many hats before they buy one and this makes salesmen very tired "
我们来分析一下这句话的语法结构
首先You know 是主句,引导后面的一个长句子,叫宾语丛句.而后面的丛句又是一个多丛复句,由AND连接两个句子,表顺承关系.,也可理解为前因后果.也就是说是 "很多女士在把帽子买下来之前要挑看很多帽子'这样一个陈述的事实 有了后面那个句子"这使得售货员很厌倦"