Split a paragraphs using RegularExpression (Regex).???

First Method =  {A-Z} <br>
Second Method =  {A-Z}<br>
Third Method =  {A-Z}.<br>
Fourth Method =  {A-Z}.


Note: Input may contain combination of all above  methods.

Please help me to find out correct Regex Formula for splitting  below paragraphs.

Input paragraphs:

{A}

Vasa. "http:///full/87/7/540" target="_blank">"Nitric Oxide Activates Telomerase and Delays Endothelial Cell Senescence"a> Circulation Research. 2000;87:540-542
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For a more detailed discussion of the mechanisms underlying the relationship between nitric oxide and telomerase activation, see this study:<br>
Farsetti.  <a href="http://quot;>The telomerase tale in vascular aging"a>  Journal of Applied Physiology January 2009 vol. 106 no. 1 333-337
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{B} <br>
Chauhan. <a href="http://science?_ob=ArticleURL&_udi=B6T18-3P945X0-8&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_version=1&_urlVersion=0&_userid=10&md5=c130cff602472f25bd5680ea3047490c" target="_blank">"Aging-Associated Endothelial Dysfunction in Humans Is Reversed by L-Arginine"</a> Journal of the American College of Cardiology Volume 28, Issue 7, December 1996, Pages 1796-1804
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{C}.<br>
Monajemi H.<a href="http://11487030" target="_blank">Gene Expression in Atherogenesis"</a>.  <i>Thromb Haemost</i>. 2001 Jul;86(1):404-12.
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{D}.
Britten M. The role of endothelial function of ischemic manifestations of coronary atherosclerosis
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Kimura Y. Impaired endothelial function in hypertensive elderly patients evaluated by high..
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{E}.<br>
9. In Cells, Aging and Human Disease, page 170, Michael Fossel writes:
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In comparing young normal human aortic endothelial cells to senescent endothelial cells and endothelial cells imoortalized with hTERT, we find differences. Compared to young endothelial cells, senescent endothelial cells show a decreased production and activity of NO, changes critial in atherogenesis and hypertension. Similarly, senescent endothelial cells demonstrate increased monocyte adhesion, again implicated in atherogenesis. [..] In all cases, these differences are amerliorated or normalized by hTERT immortalization.
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{F}.<br>
Chang E, Harley CB. Telomere length and replicative aging in human vascular tissues.