Prevent tag addition

Hi to all,

If I paste this code in ckeditor

<ul>
    <li>
        <a href="http://www.google.com">
            <img src="image.jpg" />
            <h1>BLA BLA BLA</h1>
            <p>xxx yyy zzz</p>
            <span class="info-1">SPAN 1</span>
            <span class="info-2">SPAN 2</span>
            <span class="info-3">SPAN 3</span>
            <span class="info-4">SPAN 4</span>
        </a>
    </li>
</ul>

it is transformed in this:

<ul>
    <li><a href="http://www.google.com"><img src="image.jpg" /> </a>

    <h1><a href="http://www.google.com">BLA BLA BLA</a></h1>
    <a href="http://www.google.com"> </a>

    <p><a href="http://www.google.com">xxx yyy zzz</a></p>
    <a href="http://www.google.com"> <span class="info-1">SPAN 1</span> <span class="info-2">SPAN 2</span> <span class="info-3">SPAN 3</span> <span class="info-4">SPAN 4</span> </a></li>
</ul>

How to prevent the <a ...> </a> tag addition?

Thanks in advance

Lux