she was doctor who became a specialist in women's illnesses.
这是个定语从句,who后面的内容修饰doctor
翻译:她是一名成为妇科病专家的医生.
One important thing she discovered was that chimps hunt and eat meat.
这是个定语从句+表语从句,she discovered作为thing的定语,that后面的作为表语.表语从句当中的that是不能省略的.
翻译:她发现的重要的事情之一就是黑猩猩会寻找和吃肉.