There are two ways in which you can add a line break (new line) at the end of a sentence in Jupyter Notebook Markup Cell.
Option 1: By adding two spaces
Just add two spaces at the end of the line where you want to break it into a new line.
This is line 1.
This is line 2.
Option 2: Make use of the HTML <br> tag
Alternatively, you can make use of the HTML <br> tag to break the line.
This is line 1.<br>.
This is line 2<br>.
Example:

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