一个英语句子看不明白

题目

一个英语句子看不明白
Who that cares much to know the history of man,and how the mysterious mixture behaves under the varying experiments of Time,has not dwelt,at least briefly,on the life of Saint Theresa,has not smiled with some gentleness at the thought of the little girl walking forth one morning hand-in-hand with her still smaller brother,to go and seek martyrdom in the country of the Moors?
这句话看不懂,望从语法上详细分析,再才给出翻译

答案