How to modify the trackback title

I am using the wordpress template Retrospotive 1.5.3 by Carol on wordpress 2.1.2.

Here is a link to the file to download if you would like…

https://managedtasks.com/wpthemes/retrospotive.zip

https://managedtasks.com/wpthemes/blog/index.php?wptheme=Retrospotive

I want to modify my comments file so that my track back title on other peoples blog shows just the post title, instead of the “blog name – post title”.

Here is an example from my page:

https://www.hilaryshepherd.com/rantsnraves/2007/02/28/matthew-mcconaughey/

Here is the trackback:

https://www.thedailyreel.com/spotlight/tv/archive/2006/12/12/matt-damon-does-matthew-mcconaughey/

See how it shows this:

Hollywood Gossip – Life Altering Knowledge – and More! : Matthew McConaughey!!

I just want it to show:
Matthew McConaughey!!

Here is my comments.php file:

[moderated – too much code. Please use a pastebin service such as https://wordpress.pastebin.ca and post the link back to this thread instead).