He loved best to choose themes from the simple life of the

该句话主语为：He loved to choose themes. the simple life of the poor是修饰theme的来源.the+形容词表示一类人,因此,后面的trials and hardships与the poor为所属关系,空里应该填whose是对的.先行词在定语从句中做宾语成分，当先行词提前，则宾语省略，可是whose 后面的从句没谓语啊把从句拆解为the poor knew trials and hardships of his simple life so well by bitter experience.因此knew为从句里的谓语。原句不是he knew？对不起，正确的解释应该是He know the poor's trials and hardships so well by bitter experience.我同意落红霏霏的解释~