一个英语问题进 who seemed to his teacher to be quite dull.

一个英语问题进 who seemed to his teacher to be quite dull.
Even beethoven's father discounted the possibility that his son would one day become the greatest musician in the world.The same is true of Edison,who seemed to his teacher to be quite dull.连贝多芬的父亲都不相信自己儿子日后有一天可能成为世界上最伟大的音乐家.爱迪生也同样如此,他的老师觉得他似乎过于迟钝. 最后 who seemed to his teacher to be quite dull 是不是原句落了什么单词呢?我总是翻译不通 who 应该指的 edison 他似乎 . 怎么直接插入了一个 his teacher呢 然后之后又跟了个to be. 不懂啊 . 有能给分析一下这最后一句的吗