The body (of one statue) was found among remains dating from the fifteenth century B.C.

1. remains 复数名词，意为：“剩余物;   残留物;   剩饭菜;   古代遗物;   古迹;   遗迹;   遗址;   遗体;   遗骸”。网友完全可以自己查词典解决。

2. dating from the fifteenth century B.C. 是现在分词短语，作remains 的定语。date from 意为“追溯到；始于；起源于”，跟 date back to 的意思大同小异。