怎样理解这样的英语结构?People who are sensitive to music are more likel

怎样理解这样的英语结构?
People who are sensitive to music are more likely to succeed in music.
对音乐敏感的人更有可能在音乐领域取得成功.
People sensitive to music are more likely to succeed in music.
去掉who are,它就不是一个定语从句了,那这个sensitive to music算什么呢?形容词的复合结构作定语吗?里面没有动词显然也不是非谓语动词啊?省略句吗?
What do you think?