这叫多重定语从句，根据构成形式，可分为“并列定语从句和复合定语从句”。以下是我见过的一些例句。
【并列式定语从句】
(1) The owner of the house whose wife is dead, whose son works in New York and who wants to go and live with him, is willing to sell the house at a low price. 这幢房子主人的妻子已过世，儿子在纽约工作，他想搬去和儿子一起生活，所以愿意以低价出售此房。
(2) Mr. Smith, who has a good command of French and English but who doesn’t know Chinese, finds it difficult to study Chinese literature. 史密斯先生精通法语和英语，但对中文则一无所知，所以他发现研究中国文学很困难。
(3) This is the house in which the famous man lived, which you visited 10 years ago and which becomes a museum now. 这就是那位名人居住过的房子，10年前你参观过，现在成了博物馆。
【复合式定语从句】
(1) She had a book which she believed was bought by her father at a dear price. 她有一本父亲送她的书，她相信是父亲花了大价钱专门买来送她的。
(2) She has an adopted child who she says was an orphan.  她有一个养子，据她所言，这个孩子以前是个孤儿。
(3) Can you mention anyone that we know who is so talented as he? 在我们认识的人中，你说还有谁像他一样有才华？
(4) She is the only girl that I know who can play the guitar.  她是我所认识的唯一会弹吉他的女孩。
(5) Is there anything else (that) you'd like (that) you don't see on the shelves?  有没有别的你喜欢的东西，现在架子上还没有？
▲此外，你说的 high in fat，意为“在脂肪方面含量高”。例如：
Ice cream is high in fat and sugar. 冰激凌的脂肪和糖分含量很高。

A diet high in fat may lead to obesity.一个人的饮食含脂肪过多会导致肥胖。

Eating too much food which is high in fat and sugar will result in heart illness.吃过多高脂肪和高糖类的食物会导致心脏疾病。