But there are few places where clients have more grounds for complaint than America.
但是,很少有地方像美国一样,让客户有更多的理由去投诉。
关系副词 "where" 引导限制性定语从句修饰先行词 "places",在从句中充当地点状语。从句内部 "clients have more grounds for complaint than America" 整体为完整结构,其中包含比较从句 "than America"(省略了与前文相同的谓语成分 "have grounds for complaint")。无逗号隔开,对先行词起限定作用,符合限制性定语从句特征。