How can I write the following code at single select statement?

   Category model = new Category();
        model.articles = new List<Article>();
        List<Article> articleList = new List<Article>();
        Article article = new Article();
        var childs = CurrentPage.Children;
        foreach (var content in childs)
        {
            article = new Article();
            article = getArticle(content);
            articleList.Add(article);
        }
        var posts = CurrentPage.AncestorOrSelf(1).DescendantsOrSelf()
                    .Where(x => x.HasProperty("relatedContentItem")).ToList();
        foreach (var content in posts)
        {
            ArchetypeModel fieldsetlist = content.GetPropertyValue<ArchetypeModel>("relatedContentItem");
            foreach (ArchetypeFieldsetModel fieldset in fieldsetlist)
            {
                if (fieldset.GetValue<IPublishedContent>("article") != null && fieldset.GetValue<IPublishedContent>("article").Equals(CurrentPage))
                {
                    article = new Article();
                    article = getArticle(content);
                    articleList.Add(article);
                }
            }
        }
        model.articles = articleList.OrderByDescending(x => x.PublishedDate).ToList();