《新概念英语》（第三册）第一课《A Puma at Large》Pumas are large,cat-like animals which are found in America.When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London,they were not taken ser

《新概念英语》（第三册）第一课《A Puma at Large》Pumas are large,cat-like animals which are found in America.When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London,they were not taken ser
《新概念英语》（第三册）第一课《A Puma at Large》
Pumas are large,cat-like animals which are found in America.When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London,they were not taken seriously.However,as the evidence began to accumulate,experts from the Zoo felt obliged to investigate,for the descriptions given by people who claimed to have seen the puma were extraordinarily similar.
其中,这下面这句话的句型改如何解释的?
However,as the evidence began to accumulate,experts from the Zoo felt obliged to investigate,for the descriptions given by people who claimed to have seen the puma were extraordinarily similar.

《新概念英语》（第三册）第一课《A Puma at Large》Pumas are large,cat-like animals which are found in America.When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London,they were not taken ser
首先,for是连词,将这句话分为前后两句并列分句.
对于前一分句,as引导时间状语从句,主句是experts...investigate
对于后一分句,descriptions是主语,谓语是were,表语是extraordinarily similar 其中,given...puma是过去分词后置做为descriptions的定语,而who...puma又是一句定语从句修饰people
整个结构就是这样~~

as 引导时间状语从句
for 后面跟原因
主句：However,experts from the Zoo felt obliged to investigate

然而，当证据开始不断累积，动物园的专家感到不得不进行调查，因为声称见过美洲豹的人们做出的描述惊人相似
experts from the Zoo felt obliged to investigate,
本句为中心句，主语
as the evidence began to accumulate本句为时间状语。
for the descriptions given b...

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然而，当证据开始不断累积，动物园的专家感到不得不进行调查，因为声称见过美洲豹的人们做出的描述惊人相似
experts from the Zoo felt obliged to investigate,
本句为中心句，主语
as the evidence began to accumulate本句为时间状语。
for the descriptions given by people who claimed to have seen the puma were extraordinarily similar
本句为原因状语。Who引导的是这个原因状语中的定语从句，的确是个比较复杂的句子。我建议你背过就行。新概念2的小短文非常适合背诵，对你口语的提高会有很大帮助

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呵呵，就第一课背的最熟了
as 引导的状语从句

however连接前句
as随着。。。，专家们感觉到（该做什么了）。。。，因为。。。。