Conversation so far:
What was the break?
Herc used the record to focus on a short, heavily percussive part in it: the "break".
What did the break consist of?
Specifically, DJ Kool Herc: extended an instrumental beat (breaking or scratching) to let people dance longer.
Did people like it?
...
[This] helped lay the foundation for a cultural revolution.
How did it lead to a cultural evolution?
extended an instrumental beat (breaking or scratching) to let people dance longer (break dancing) and began MC'ing (rapping) during the extended breakdancing.
...
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Question: Did he influence others?
Self-contained rewrite: Did Herc influence others?