▲注意这是一个被动语态的句子：

本句的基本结构是 think highly of sb，你的句子可以这样改一下：

For what it’s worth, people think very highly of him abroad.

这个句子变成被动语态即是：

For what it’s worth, she’s very highly thought of abroad.

句子意思是：不管是真是假，在海外人们对她评价很高。

句中的 abroad 是地点状语。

▲再比较：

His students thought very highly of Professor Heynman. 海曼教授的学生对他评价很高。

Professor Heynman was very highly spoken of by his students. 海曼教授的学生对他评价很高。

▲关于  for what it is worth：

句中的 for what it is worth 是习语，意思是“不论是真是假”“不管是好是坏”“不管有用与否”“无论价值如何”。又如：

Here's the list of names, for what it's worth. 这里有一张名单，不一定能派上用场。

For what it's worth, I think he may be right. 不论是否有价值，我认为他可能是正确的。

They are, for what it's worth, the single most successful eastern arts group in the West. 无论是否重要，他们是西方唯一一个最为成功的东方艺术群体。