分詞構句？

[gary70812 (1)]

如下圖：
http://i.imgur.com/fyX5V4F.jpg

想請問“,stemming .... statement” 這句，這是什麼文法呢？

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推 dahi: It comes from this: ", which stems...." Notice that the
→ dahi: "comma plus which" is usually understood as a parentheti
→ dahi: -cal usage and the which here represents the whole sente
→ dahi: -nce before it instead of the noun before it.