It is not possible to have several new paragraphs in the text of a Span. This is due to the fact that Spans are inline elements and each span is a children of one paragraph.
This article shows how you can add one paragraph to the document depending on whether the document has been measured and arranged or not. If you would like to insert some more complex piece into a document, you should create a document fragment and insert it in the place you would like it to appear.
You can find more information on how to create a DocumentFragment in this forum post.
All the best,
the Telerik team
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