The incidents of the next few days are indelibly graven upon my recollection, and I can tell them without reference to the notes made at the time. 

I start them from the day which succeeded that upon which I had established two facts of great importance, 

the one that Mrs. Laura Lyons of Coombe Tracey had written to Sir Charles Baskerville and made an appointment with him at the very place and hour that he met his death, 

the other that the lurking man upon the moor was to be found among the stone huts upon the hillside. 

老师，看不懂“which succeeded that upon which” 麻烦老师分析一下这块的语法成分，非常感谢！