1. It's impossible to overestimate the influence (that) Stanley Ho had in Macau and Hong Kong. 

2. Ho's fortunes were tightly linked with the growth of Macau from a small fishing town to a wealth gambling centre. 

第一句，划线部分显然是定语从句，省略了在从句作宾语的关系代词 that。

第二句，在linked 之后明显漏掉了介词 with。搭配：be linked with 与...有关。

翻译：

1. 何鸿燊在澳门和香港的影响力怎么估量都不过分。

2. 何鸿燊的财富与澳门从一个小渔村发展成为一个财富赌博中心密切相关。