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此话如何理解，句子结构是什么
Suddenly last week,however,facts came raining down,in effect making further scientific debate on what mainly causes the problem all but irrelevant.
不知道在这里发帖子对不对~~~~
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[Suddenly last week],[however],facts came raining down,[in effect making (further) (scientific) debate on (what mainly causes the problem all but irrelevant.)]
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然而上周突然大量事实涌来，结果引起进一步争论：主要是什么引起了这个几乎不相干的问题的。
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二楼分析得不错，
不过句子主干写facts came为佳。