you can try something like this
find
<tr>
<td valign="top" align="right"><span class="genmed">{L_PIC_DESC}:</span></td>
<td valign="top" align="left"><div class="post-text">{PIC_DESC}</div></td>
</tr>
replace with
<tr>
<td valign="top" align="right"><span class="genmed">{L_PIC_DESC}:</span></td>
</tr>
<table>
<tr>
<td valign="top" align="left"><div class="post-text">{PIC_DESC}</div></td>
</tr>
</table>