求英语高手翻译一句话,解释一下句子结构

他记得他的祖母是个铁石心肠的人。he remembers his grandmother是主句,as being “tough as nails”是宾补,修饰grandmother,be tough as nails 是铁石心肠的意思。remember sb/sth as （doing）是一个句式,可以记一下。