"un-group" Product Features - prestashop

Question

In product-details.tpl the features, when grouped, are printed inside a single
For example:
<dl>
<dt>FEATURE</dt>
<dd>Value1 Value2 Value3</dd>
</dl>
I want to print the following:
Code:
<dl>
<dt>FEATURE</dt>
<dd>
<span title="value1">Value1</span>
<span title="value2">Value2</span>
<span title="value2">Value3</span>
</dd>
</dl>
This is the original code
{block name='product_features'}
{if $product.grouped_features}
<section>
<h3>{l s='Data sheet' d='Shop.Theme.Catalog'}</h3>
<dl>
{foreach from=$product.grouped_features item=feature}
<dt>{$feature.name}</dt>
<dd>{$feature.value|escape:'htmlall'|nl2br nofilter}</dd>
{/foreach}
</dl>
</section>
{/if}
{/block}
I tried
{if $product.grouped_features}
<section>
<h3>{l s='Data sheet' d='Shop.Theme.Catalog'}</h3>
<dl>
{foreach from=$product.grouped_features item=feature}
<dt>{$feature.name}</dt>
<dd>{foreach $feature.value}<span title="{$feature.value|replace:' ':'_'}">{$feature.value|escape:'htmlall'|nl2br nofilter}</span>{/foreach}</dd>
{/foreach}
</dl>
</section>
{/if}
But of course doesn't work..
Most grateful for any help possible.
Thank you

Answer 1

Try with:
{block name='product_features'}
{if $product.grouped_features}
<section>
<h3>{l s='Data sheet' d='Shop.Theme.Catalog'}</h3>
<dl>
{foreach from=$product.grouped_features item=feature}
<dt>{$feature.name}</dt>
{assign var=detail_feature value="<br />"|explode:$feature.value}
<dd>
{foreach from=$detail_feature item=det_feature}
<span title="{$det_feature|escape:'htmlall'|nl2br nofilter}">{$det_feature|escape:'htmlall'|nl2br nofilter}</span>
{/foreach}
</dd>
{/foreach}
</dl>
</section>
{/if}
{/block}