So this method basically splits up a text node into a list of new nodes and then inserts them into the parent node and removes the original text node.

So if the original XML looks like this:
```xml
<node>Some text with\nnewlines\naround</node>
```

We would take that single text node and turn it into three text nodes with two break nodes between them:
```xml
<node>Some text with<w:br/>newlines<w:br/>around</node>
```