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treatment_page_hero - group
  hero_content - group
     custom_title - text
     subtitle - text
     treatment - textarea
     
     
<p class="blurb-textarea">
    <?php

    if( have_rows('treatment_page_hero') ): while ( have_rows('treatment_page_hero') ) : the_row();
            if( have_rows('hero_content') ): while ( have_rows('hero_content') ) : the_row();
                the_sub_field('treatment');
            endwhile; endif;
    endwhile;  endif;
    ?>
</p>