If you are uncomfortable typing the html by hand you can copy/paste from a wysiwyg.
I hope that helps you.
function myBlockFunction()
{
$block['array_a'] = array('a','b','c','d');
$block['array_b'] = array('1','2','3','4');
return $block;
}
// in template
<p>
<{foreach item=array_a from=$block.array_a }>
<{ $array_a }>
<{/foreach}>
</p>
<p>
<{foreach item=array_b from=$block.array_b }>
<{ $array_b }>
<{/foreach}>
</p>