此句子中逗號後面的句子主詞與動詞為何省略?又哪些時候能省略?

請問此句子中逗號後面的句子主詞與動詞為何能省略?又哪些時候能省略?
:The moon illuminated the night sky,making it almost as bright as day.
↑(主詞與動詞???)
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