in addition to是比较常见很常用的短语,表示“除了、还有”的意思
In addition to整个词组相当于一个介词,所以to的后面要接宾语.
例如:
In addition to native plants,this garden contains numerous trees and flowers from overseas.
除了当地的植物之外,这座花园还有无数来自海外的花草树木.
在你上面这个例句里,应该是做状语,可以置于句首,In addition to normal work,they have one hour to read newspapers.（除了日常工作外,他们还有幸可以看报纸）
have one hour to do sth(这里one hour其实就是宾语,to do 是不定式做宾补）