Each plugin that imports custom content has some shortcodes available that will include all imported posts into the page where you include the shortcode.
The shortcode’s name differs from plugin to plugin, but generally it’s name is in this format: [<plugin_name>_display_posts] and [<plugin_name>_list_posts]. For example, for Youtubomatic plugin, the shortcode’s name is [youtubomatic_display_posts] and [youtubomatic_list_posts]. For more info about these shortcodes, please check plugin’s documentation or the plugin’s ‘Main Settings’ page.