如何在Wordpress中组合小部件

I'm trying to merge two widgets that show on the same row (left and right) the template is build to host text on the left and a gravity form on the right. I want instead a full width area without splitting the row in two columns.

The template does this (nasty imo) also in other areas but has some pros that I wish to preserve. How hard would be to turn it into a full width area (1 widget) and what steps should I follow?

You would create a child theme and then overwrite the template that is being used to create the widget area. You should also disable the widget location that you are removing so that it isn't shown in the admin. You can use the following code to remove the widget area.

function remove_some_widgets(){
    unregister_sidebar( 'first-footer-widget-area' );
}
add_action( 'widgets_init', 'remove_some_widgets', 11 );

You would replace 'first-footer-widget-area' with the identifier for the widget area you are removing.

I can't give a code example for combining the widget areas because it would depend on the code available in your theme. In case you don't have a child theme, here is a link for how to create one: https://codex.wordpress.org/Child_Themes