What was once seem as a sign of sophistication is now more l

首先,seem打错了,seen才对.
没错,是有两个谓语,was和is.但它们分别属于不同的句子,互相独立,互不影响.
这是一个主语从句.was 是属于主语从句What was once seen as a sign of sophistication（为了方便表达,我们把它记作A）的；那么句子的结构可以这样表达：A is now more likely to be regarded as a dirty hoppy,这是主句.可见,is 是属于主句的谓语的.

was 应删；seem后面加ed, 句子就通顺了。更有可能的是，原文或者是What was once deemed as a sign ... 之误。

was是主语从句中的谓语，is是句子的谓语。

你好。你的句子的前半部分里面只能有was或者seemed,只能保留一个，否则就是错句。
1 What was once a sign of sophistication is now more likely to be regarded as a dirty hoppy

2 What once seemed to be a sign of sophisticati...