To prove this, remove all of the phrase between the commas to get “He uses many examples of mob gatherings and how their power in numbers helped change the social structure.” With the phrase removed, the sentence still makes sense. Without the commas, the sentence is awkward and difficult to figure out.

He uses many examples of mob gatherings and how their power in numbers, even though it led to violence, helped change the social structure.

This is a good example of real British English. Other responses are not worth reading. Out of all the responses only one other person has picked this up and even the so called “English Expert” is way off the subject. The person that put a full stop mid-sentence created absolutely apalling grammar. What do you think a “conjunctive” is for? The sentence is a full and complete sentence and should not be seperated, only pauses (commas) should be used. And please, all the Yanks out there, stop doing this – ,and

You cannot have a comma in front of a conjunctive in the English language. Why do stupid Yanks insist that a pause is required when forming one sentence from two? The conjunctive is there to make it possible to continue without a pause or stopping. If you want to pause, use a full stop and start a new sentence but please stop using ,and

He uses many examples of mob gatherings and how their power in numbers, even though it led to violence, helped change the social structure.

Does that work?

First off, you’re spelling words wrong and missing a couple nouns.

He uses many examples of mob gatherings and how they’re power in numbers; even though it led to violence, it helped change the social structure.

Make sure after “numbers” you place a semi-colon (this separates two phrases that can be sentences on their own). “Their” should be “they’re.” You’re also missing a noun between “violence” and “helped,” so I added “it.”

i hope i can change ur sentence atichy bit.according 2 me,its-

” He uses many examples of mob gatherings and their power in numbers, even though it led to violence and helped change the social structure.”

He uses many examples of mob gatherings and their power in numbers, even though its lead to violence helped change the social structure.

Hope that helped!

I think those are right