Yes you can combine them.
If your home page content is currently a post not a page you have to copy its content to a new WordPress page called Home. That is because if it is a post the home page is configured as the blog (posts) page, and you want the posts page to be elsewhere.
Either way, make a new page called Blog. If the home page is now a post, also make a new page called Home.
Then go to Dashboard / Settings / Reading.
Set a static home page of Home and a posts page of Blog.
If using the WordPress menu system (Dashboard / Appearance / Menu) you will need to add these to the menu. Replace the existing Home option with the new page called Home, and the existing link to the blog with the new blog page.
Now you need to export your blog posts from the current blog
(Dashboard / Tools / Export) which creates a WordPress export file.
Then on the main site go to Dashboard / Tools / Import - you will have to install the import plugin as prompted - then specify the export file you created from the current blog which will load the blog posts into the main site.
If you want the blog URL to be http://starrline.com/starrtalk/ as it is now, you will have to take the existing blog offline as that URL is already being used by the second WordPress site. After you do that you can change the permalink on the new Blog page you made on the main site from /blog/ to /starrtalk/ which will assign the URL to the new blog.
A fast way to get the the old blog out of the way is using FTP change the name of the root blog folder /starrtalk/ to something like /starrtak-old/ Once you do that you will be unable to access the old blog in WordPress, neither the front end nor the admin area, so make that the last step after everything is working correctly on the new blog at the /blog/ url.