what it called authoritative sources是what引导的宾语从句，整个做quote 的宾语。
The News Agency quoted what it called authoritative sources ：新闻社引用了据称权威人士的话说。。。。
The News Agency：主语；
quoted ：谓语；
what it called authoritative sources ：宾语
The News Agency quoted XXX as XXX
What it (is) called authoritative sources 是一个名词结构做quote的宾语，saying.....分词结构也是相当与一个名词
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