请帮忙说下此句的语法和句型.

题目

请帮忙说下此句的语法和句型.
SCARLETT O’HARA was not beautiful,but men seldom realized it when caught
by her charm as the Tarleton twins were.

答案

《乱世佳人》的片段吧?
斯嘉丽·奥哈拉并不是个大美人,可是男人们却为她的美丽所倾倒,很少在乎这一点,塔尔顿孪生兄弟也无法免俗.
此句的语法不是很难啊?
整体是两句转折并列句,以but连接；
but引导的转折句中,主语是men,谓语是realized,宾语是it.
when caught by her charm是非谓语动词（过去分词）作转折句的时间状语；
as the Tarleton twins were 是方式状语从句,as是引导词,“和……一样”、“如同……”的意思；相当于说,the Tarleton twins were also caught by her charm.