解析一句英语In 1929,three years after his flight over the North Po

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解析一句英语
In 1929,three years after his flight over the North Pole,the American explorer,R.E Byrd,successfully flew over the South pole for the first time.
我知道这句话的意思是：美国探险家R.E伯特在飞越北极3年之后,于是1929年第一次成功的飞越了南极.（在书上看来的）
我觉得这句话的语序很乱,如果不是看书上的解释我真的不知道该怎样理解它,
这里有几个问题,它是个什么句子?、它的主谓宾在哪里?、为什么中间有很多逗号隔开,或在哪些地方需要用逗号隔开?大家了解的尽可能多说一些,我对语法知道的很少,

In 1929（时间状语）,three years（1929的同位语） after his flight （after后面跟名词flight做宾语）over the North Pole,the American explorer（主语）,R.E Byrd（主语的同位语,对主语补充说明）,successfully flew over（谓语） the South pole（宾语） for the first time（状语）.
其实语序不乱,只是插入了两个同位语（,three years after his flight over the North Pole,和R.E Byrd,）,所以看起来乱.把两个同位语都是前后用逗号分开,把它们去掉来看,你就能找到句子的主谓宾了.

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