say that 后面只有一个句子,做say的宾语从句the impossibility 主语of conceiving that this grand and wondrous universe,with our conscious selves,arose through chance 定语seems 谓语动词...arose through修饰那个部分arose through chance修饰impossibility好像是this grand and wondrous universe, with our conscious selves吧之前错了arose through chance修饰你说的universe