句子1：They all had terrible internal injuries, such as had not been seen in Europe, America or Australia since the 19th century. Here these were endemic, owing to the malnutrition that meant the bodies of Ethiopian girls remained small.
句子2：Boris Johnson, Britains prime minister, hates the notion of Brexit extensions, such as those his prdecessor, Theresa May, had to accept repeatedly.
我感觉，好像有点像是非限定性关系分句的先行词，请各位老师解惑。
such as
一般词典的讲解是：ofthekindspecified
来担当。
这个such as局部的结构，跟这句话非常有相通之处：
Cook was a strict but good captain,one whousually took care of the sailors on his ship.
one who = [who was] a captain who
