Albert einstein,---- life had once been very hard,was given

Albert einstein,---- life had once been very hard,was given the Nobel price for physics in 1921.
for whom 为什么用 for whom 而不用 in whom
介词怎么选?

调整下语序可以成为life had once been very hard for him
如果改为in whom,则变更语序就成为了
life had once been very hard in him,不成立
不清楚的话欢迎追问~~
再问： 以后做定从的题 介词+关代 中的介词怎么选?
再答： 像这种题，调整语序，把选项代入重新读一遍，找准介词的连接对象，一般来说简化了句子结构之后都容易很多了。可以把不需要的形容词副词等等去掉。个人经验~~觉得蛮有用的