英语句子成分疑问（同位语）

She also knew from previous work conducted on birds and dolphins that these animals put half of their brains to sleep at a time so that they can rest while remaining alert enough to avoid predators .

这里的红色部分conducted...和紫色部分that.....都是作同位语修饰work吗？

你对句子结构理解错误。

from previous work conducted on birds and dolphins 这个介词短语是knew的状语（来源），其中conducted...为过去分词短语作定语修饰work.

that从句是knew的宾语从句。

句中没同位语。