Advice for splitting text

Hello,
You know how in a news column online a lot of times you'll read a paragraph
of the article and then there will be a link for "Read More", and you'll
either follow an anchor on the same page to the rest of the article or jump
to a new page all together.  So what I'd like to do is provide a text object
embedded in the article which signifies that the more link should be place
here.  See "[BREAKARTICLE]" in this example:

<ARTICLE id="1234">
    <HEADING>This Article</HEADING.
    <CONTENT>
        This is the content This is the content This is the content This is
the content This is the content This is the content
        This is the content This is the content This is the content This is
the content This is the content This is the content
        This is the content This is the content This is the content This is
the content This is the content This is the content
        This is the content [BREAKARTICLE] This is the content This is the
content This is the content This is the content
        This is the content This is the content This is the content This is
the content This is the content This is the content
        This is the content This is the content This is the content This is
the content This is the content This is the content
        This is the content This is the content This is the content This is
the content This is the content This is the content
        This is the content This is the content This is the content This is
the content This is the content This is the content
        This is the content This is the content This is the content This is
the content This is the content This is the content
        This is the content This is the content This is the content This is
the content This is the content This is the content
    </CONTENT>
</ARTICLE>


What would be the best way to split this article at this point?  Then of
course, when displaying the entire article, the best way to hide this break
point?

Thanks for the help,
Karl


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