No doubt the ravages of time have affected the purity of that civilization as they have that of many other cultures and many institutions.
热心网友
毫无疑问，时间的摧残已影响了那种文明的纯洁性，因为这些摧残催生了其他的多元文化和多种制度。as引导原因状语从句，they指代前文的savages,have是产生，that代表前面的purity。
热心网友
毫无疑问随着时间的破坏,产生了许多其它的文化和制度,已经影响了原来的纯洁和文明.