{{ content.field_description }}
{{ content.field_link }}

<p>Dramatically create 24/7 paradigms via ubiquitous information. </p>
<a href="some/path/">Read More</a>

{{ content.field_description }}

<p>Dramatically create 24/7 paradigms via ubiquitous information. <a href="some/path/">Read More</a></p>

function mytheme_preprocess_paragraph__plain_text(&$variables) {
  $pr_plain = $variables['elements']['#paragraph'];
  if(!$pr_plain->get('field_link')->isEmpty()) {
    $pr_link_field = $pr_plain->get('field_link')->first();
    $pr_link_uri = $pr_link_field->uri;
    $pr_link_title = $pr_link_field->title;

    $pr_description = $pr_plain->get('field_description');
    ksm($pr_description); // this did not provide method or array such as `#suffix`
  }
}