You would need to create a page template and query those pages directly.
$args = array(
'post_type' => 'page',
'post__in' => array(430,436,433), //The Page IDs you want to query
'order' => 'ASC'
);
$page_query = new WP_Query($args);
If you wanted to do this automatically and get the child pages of the current page you could use something like this:
<?php
// Set up the arguments for retrieving the pages
$args = array(
'post_type' => 'page',
'numberposts' => -1,
// $post->ID gets the ID of the current page
'post_parent' => $post->ID,
'order' => ASC,
'orderby' => title
);
$subpages = get_posts($args);
// Just another WordPress Loop
foreach($subpages as $post) :
setup_postdata($post);
?>
<h4><?php the_title(); ?></h4>
<?php the_content(); ?>
<?php endforeach; ?>