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您好， 我想問的事下面句子的后半部分 the first sign of ... 和前半部分到底是什么關系：

1. 定語？ the first sign of .. 相當于 which is the first sign of ...,  但是單個名詞作定語修飾整個句子語法正確嗎？

2. 同位語？ the first sign ...是整個句子的同位語， 但是這和平常的同位語大不一樣啊， 通常是從句時某個名詞的同位語 如  There is a sign that ... 

China pledged on Monday to reform its laojiao system, the first sign of long-awaited progress after a senior official had promised to modify the controversial re-education-through-labor system

Thx in advance