Name from parent category and child category

The desired breadcrumb trail result isn’t possible to achieve via the breadcrumb templates with the out of the box breadcrumb template tags. You could add a custom template tag to achieve this, but there are other and better ways by hooking into the bcn_breadcrumb_title filter. That said, the proposed breadcrumb structure doesn’t really the follow the rules of having a hierarchy (the current item should not be a combination of a child and parent, for terms the parent already has all of the child term’s posts in it in addition to all of the posts that are explicitly in the parent term).