One example is Bangladesh, a new social class which showed optimism of transitioning to a developed country within its population of 173 million, now fighting to the right to work.

can you rate this setnce out of 10 and gvie 10/10 version

I would rate the given sentence a 6/10. While it conveys the main idea, it could be more concise and clearer in its message. A potential revised version could be:

"Bangladesh, with its population of 173 million, once optimistic about the transition to a developed country, is now fighting for the right to work."