If it was me I’d not echo the text I’d make it a variable e.g. $additional_text = "" then at the end of the function return $additional_text;.
if (have_posts()) : while (have_posts()) : the_post();
$additional_text="<div class="timeline">";
$additional_text .= '<a href="';
$additional_text .= the_permalink();
$additional_text .= '"><h3>';
$additional_text .= the_title();
$additional_text .= '</h3></a>';
$additional_text .= '</div>';
endwhile; else:
$additional_text="No Posts Sorry.";
endif;
Then, when you call the function it’s going to get the variable as opposed to writing to the page.
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