句子请教

zipee

王若平－难句分析－定语从句－第02页的第2句:
If they can each be trusted to take such responsibilities,and to exercise such initiative as falls within their sphere,then administrative overhead will be low.
其中：as falls within their sphere中的as在这里怎么解释?是什么结构？

tinbbs

as 是跟前面两个such连用的