what is even more important is that as the earth cooled down.句中的as这样不是有两个连词?怎样理解

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what is even more important is that as the earth cooled down.句中的as这样不是有两个连词?怎样理解

what is even more important is that as the earth cooled down.如果句子只有这么长的话,句中的as是连词,表示"当...的时候,随着..." 并没有2个连词
that 是指示代词,表示那(也可以翻译成这)个(东西/事物)
what is even more important 做主语,更重要的事/物.
is系动词
that指示代词做表语,整个前句what is even more important is that为主句,后句as the earth cooled down做时间状语从句
翻译:随着地球的冷却,更要紧的是那(这)件事.