Broken links

Hi,

I tried using this plugin but now all my links are broken. The URLS did not match completely, the old ones were https://website.se/2016/june/post-title.html and the new ones are https://website.se/2016/06/2016_june_post_title.html, so when I imported the old content the links kept the date information as well as the post title from the old post. When I used the plugin the new links are now https://website.se/2016/06/post_title.html so some of the information got lost, resulting in broken links. Is this fixable in any way? I really don’t want to fix each link manually.