Importing Nationbuilder data into WordPress

Hi All,
I’m trying to workout how to import data from a Nationbuilder snapshot into a WordPress install. Nationbuilder data is in PostgreSQL format. I’m really just after the blog content from the Nationbuilder site.

I presume I have to convert it to MySQl somehow and then edit that database to make it compatible with WordPress. Is that correct?

Does anyone know of any tools that might help to do this?

Thanks in advance for any help.