长难句2

Although numerous books have been written about American mothers, only recently has literature focused on the role of a father.

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• although conj.虽然；尽管
• numerous adj.很多的；许多的
• written adj.书面的 v.写
• literature n. 文学；文学作品；文献；图书资料
• focused adj.聚焦的；专心的 v. 聚焦；注视
• role n. 作用；职责；角色

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focused为整句谓语，句子结构为主谓宾，主语是literature，宾语是role；Although numerous books have been written about American mothers为Although引导的让步状语从句，从句谓语为written，为主谓结构，主语是books；only后接状语引导倒装（has literature）表示强调。

译：虽然有很多关于美国母亲的书，但直到最近才有文学关注父亲的角色。