1、As chief information officer, he was one of the world's largest corporate buyers of technology, and directed the technology strategy of a company renowned for its deft use of computing to streamline everything from global procurement to neighborhood shopping trends.

2、In the last few years, as chief executive of Sam's Club, Mr. Turner improved the performance of the warehouse clubs and closed the gap with Costco, its rival in that market and a rare competitor that has not withered under Wal-Mart's assault.

参考答案:

1、As chief information officer, he was one of the world's largest corporate buyers of technology, and directed the technology strategy of a company renowned for its deft use of computing to streamline everything from global procurement to neighborhood shopping trends.
作为信息部的首席执行官，他是全世界最大的技术采购者之一，并掌管了一家技术策略公司，该公司以熟练运用计算从全球采购到邻近购物趋向的一切而著称。（感觉最后半句翻译得有问题，但暂时想不到更好的）

2、In the last few years, as chief executive of Sam's Club, Mr. Turner improved the performance of the warehouse clubs and closed the gap with Costco, its rival in that market and a rare competitor that has not withered under Wal-Mart's assault.
在最近的几年里，作为萨姆俱乐部的主要管理者，特纳先生完善了商厦俱乐部的运作并拉近了与克斯特克之间的距离，这是它在那个市场的对手，也是非常杰出的没有在沃尔玛的袭击中倒下的竞争者。

这些都是我自己找出来的句子，也是自己独立翻译的，肯定有很多错误，希望大家批评指正，谢谢。（本期难句来源8月6日《纽约时报》经济类头条）