Change title / subtitle structure

Hi, I’m trying to change the Title and Subtitle hompeage structure.

Right now I have something like this:
<h2>
Title
<p>
Subtitle
</p>
</h2>

I want to change in:
<h2>
Title
</h2>`
<p>
Subtitle
</p>

I found this piece of code that generate the title/subtitle but I can’t find a way to modify it:

`if ( ! function_exists( ‘cardstyle_blog_title’ ) ) {

function cardstyle_blog_title() {
global $post;
$heading = esc_html( get_theme_mod(‘blog-heading’) );
$subheading = esc_html( get_theme_mod(‘blog-subheading’) );
if($heading) {
$title = $heading;
} else {
$title = esc_html( get_bloginfo(‘name’) );
}
if($subheading) {
$title = $title.’ <p>’.$subheading.'</p>’;
}

return $title;
}

}

How I can do that?

Thank you so much.