同学你好，该知识点来自沪江网校《大学水平直达CATTI三级(笔译+口译）【4月班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好~

稍微有点句式杂糅哦~more than four decades是一个名词词组，前面没有介词的时候在句子里做了主语，造成前半句没有谓语，但是也不是后半句的从属结构。
可以改成More than four decades have passed since the establishment of China-US diplomatic relationships, and the rapid developping econominc cooperation and  trade are the conerstone to ensure us drive forward through winds and waves.
或者：For more than four decades, the establishment of China-US diplomatic relationship has seen rapid developping econominc cooperation and  trade are the conerstone to ensure us drive forward through winds and waves.

希望帮到同学~