Please try this
<?php
$term = get_queried_object();
$term_id = $term->term_id;
$taxonomy_name = $term->taxonomy;
$termchildren = get_term_children( $term_id, $taxonomy_name );?>
<?php foreach ( $termchildren as $child ) {
$term = get_term_by( \'id\', $child, $taxonomy_name ); ?>
<li>
<?php echo $term->name; ?>
<?php echo $term->description; ?>
</li>
<?php }
if ( have_posts() ) :
/* Start the Loop */
while ( have_posts() ) : the_post();
echo get_the_title($post->ID);
endwhile;
the_posts_pagination( array(
\'prev_text\' => twentyseventeen_get_svg( array( \'icon\' => \'arrow-left\' ) ) . \'<span class="screen-reader-text">\' . __( \'Previous page\', \'twentyseventeen\' ) . \'</span>\',
\'next_text\' => \'<span class="screen-reader-text">\' . __( \'Next page\', \'twentyseventeen\' ) . \'</span>\' . twentyseventeen_get_svg( array( \'icon\' => \'arrow-right\' ) ),
\'before_page_number\' => \'<span class="meta-nav screen-reader-text">\' . __( \'Page\', \'twentyseventeen\' ) . \' </span>\',
) );
?>