Needed String Split with children

Friends,
I have been holding off on this question, but I find myself
confronting it more and more. I have not really figured out how to
get around it. So I have instead tagged the string I wanted to split
when the string is in a node with children.

What I would like is to split a string, but then be able to either
replace the children as nodes, or to replace the coded string that I
split off.

I have created a template to capture the last part of each string and
render it. However, I cannot figure out how to rebuild the rest of
the string with its original children, nor how to replace the string
I have now captured and coded.

XML:
<Books>
<FLD>Calvin, John. <I>The Bondage and Liberation of the Will</I>.
Baker Books, Inc., 1996.</FLD>
<FLD>Deissmann, Adolf. <I>Light from the Ancient East</I>. George A.
Doran, Co., 1927.</FLD>
<FLD>Lightfoot, J. B. <I>Notes on the 1<SUP>st</SUP> four Epistles of
Saint Paul.</I> Hendrikson Publishers, Inc., 1995.</FLD>
</Books>

My output:
<Books>
<FLD>Calvin, John. The Bondage and Liberation of the Will. Baker
Books, Inc., <UNITDATE>1996</UNITDATE>.</FLD>
<FLD>Deissmann, Adolf. Light from the Ancient East. George A. Doran,
Co., <UNITDATE>1927</UNITDATE>.</FLD>
<FLD>Lightfoot, J. B. Notes on the 1st four Epistles of Saint Paul.
Hendrikson Publishers, Inc., <UNITDATE>1995</UNITDATE>.</FLD>
</Books>

This example is rather simplified, but the need is still the same.

Thanks,
Mike Ferrando
Washington, DC

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