英语达人进,一个句子的结构不理解
During the ceremony,Grandpa wept along with the rest of the family,tears that were a combination of joy and sadness.
这句话前面的都好理解,但后面出来一个“tears that were a combination of joy and sadness”这算什么句子结构呀,就一个tears后面跟个tears的定语,但放在整句中做什么成分呢,不理解.请指教!