. Although perhaps only 1 percent of the life that has started somewhere will develop into highly complex and intelligent patterns，so vast is the number of planets that intelligent life is bound to be a natural part of the universe.

　　结构分析:句子的框架是Although…，so vast is the number of planets that…。主句为so…that…结构引导的结果状语从句，因强调vast,so vast放在句首进行倒装,正常语序为the number of planets is so vast that…。although引导让步状语从句。此从句中套嵌一个关系代词that引导的定语从句修饰life。be bound to意为“一定,必定”。

　　译文: 虽然在某处已经开始的生命中，可能仅有百分之一会发展成高度复杂、有智慧的形式，但是行星的数目如此之多,以致于有智慧的生命,一定是宇宙的一个天然组成部分。