I recommend attempting to google the answer to your question for at least 30 minutes prior to posting on a website such as this, as such queries will usually return useful information.
Either way, to create a line-break, you can use \n
Integrating this into usable code, you can do, for example:
message.channel.send('Line one \n Line two \n Line three')
If this isn’t an answer to your question, I recommend trying to rephrase it so that it is more comprehensible.
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