Wow, this is getting into programming!
It may seem that way, but really it's not; I promise! Making a Child Theme is pretty simple.
Not sure how to create a child theme, so I took the easy way out and just commented out the_widget() code in the sidebar-left.php.
Please note that those changes will get over-written the next time the Theme is updated. I wrote a tutorial specifically for how to create an Oneology Child Theme; give it a read. I would recommend putting those two template files into the Child Theme; then, you never have to worry about them being over-written!
So, now, it is working fine, except that there is a large blank space. I'd have liked the blog post area to expand and occupy that space. Am I asking for too much?
Have you tried changing the single blog post layout, either the default layout, or per-post?
Dashboard -> Appearance -> Oenology Settings -> Layouts, and see if one of the alternate layouts suits your needs better.
Thanks for your patience.
My pleasure! I'm glad to know that people are using and benefiting from the Theme!