Twig-шаблон компонента bitrix:news.list для вывода новостей (см. http://marketplace.1c-bitrix.ru/solutions/htc.twigintegrationmodule/)

result_modifier.php

<?php

foreach ($arResult["ITEMS"] as $key => $value) {
    $userId = $value["PROPERTIES"]["AUTHOR_ID"]["VALUE"];
    $userSelection = CUser::GetByID($userId);
    $userData = $userSelection->Fetch();

    $fullName = $userData["NAME"] . " " . $userData["LAST_NAME"];
    $arResult["ITEMS"][$key]["FULL_NAME"] = $fullName;
}

template.twig

{% if result.ITEMS is not empty %}
    <div class="page-content-box page-content-box__comment-list-wrapper">
        <h2 class="page-content-box-head" id="comments-count-title">
            {% set commentsCount = result.ITEMS|length %}
            {{ commentsCount }} {{ langMessages["COMMENTS_STRING"]|russianPluralForm(commentsCount) }}
        </h2>
        <div class="page-content-box-body">
            <ul class="comment-list">
                {% for item in result.ITEMS %}
                    <li class="comment-elem" data-id="{{ item.ID }}">
                        <div class="comment-user-name">
                            <span class="icon icon__user"></span>
                            {{ item.FULL_NAME }}
                            <div class="comment-date">{{ item.ACTIVE_FROM | formatLocalizedDate('FULL_CONDITIONAL') }}, {{ item.ACTIVE_FROM | formatLocalizedDate('TIME') }}</div>
                        </div>
                        <div class="comment-user-wrapper">
                            <p class="comment-user-p">
                                {{ item.DETAIL_TEXT }}
                            </p>
                        </div>
                    </li>
                {% endfor %}
            </ul>
        </div>
    </div>
{% endif %}