Combine multiple menus using the filter wp_nav_menu_items

Thankful to the Lord, I found a solution for anyone else that comes across this issue. I took this function from the WordPress codex and modified it to soot my needs

function get_menu($menu_name) {

    $menu_items = wp_get_nav_menu_items($menu_name);
    $menu_list="";
    $count = 0;
    $submenu = false;

    foreach( $menu_items as $menu_item ) {

        $link = $menu_item->url;
        $title = $menu_item->title;

        if ( !$menu_item->menu_item_parent ) {

            $parent_id = $menu_item->ID; 

            if(!empty($menu_items[$count + 1]) && $menu_items[ $count + 1 ]->menu_item_parent == $parent_id ) { //Checking for child

                $menu_list .= '<li class="menu-item menu-item-has-children"><a href="'.$link.'">'.$title.'</a>';

            }else{

                $menu_list .= '<li class="menu-item"><a href="'.$link.'">'.$title.'</a>';

            }

        }

        if ( $parent_id == $menu_item->menu_item_parent ) {

            if ( !$submenu ) {

                $submenu = true;
                $menu_list .= '<ul class="sub-menu">';

            }

            $menu_list .= '<li class="menu-item"><a href="'.$link.'">'.$title.'</a></li>';

            if(empty($menu_items[$count + 1]) || $menu_items[ $count + 1 ]->menu_item_parent != $parent_id && $submenu) {

                $menu_list .= '</ul>';
                $submenu = false;

            }

        }

        if (empty($menu_items[$count + 1]) || $menu_items[ $count + 1 ]->menu_item_parent != $parent_id ) { 

            $menu_list .= '</li>';      
            $submenu = false;

        }

        $count++;

    }

    return $menu_list;

}

I then called the function from my menu filter (see function above) like this.

if( 'main-menu' === $args -> menu ) {
        $items .= $fcs_menu = get_menu('SECOND MENU NAME GOES HERE');
        $items .= '<li class="menu-item company-info">'.do_shortcode('[show-company-info]').'</li>';
        $items .= '<li class="menu-item social-networks">'.$social_icons.'</li>';
    }

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