Personally, I am not a big fan of hiding the breadcrumb navigation like this but if you are really struggling to fit in the breadcrumb on the screen this might be something you are after. Only the 1st few characters of each breadcrumb element are shown by default and when you hover over them it expands to show the full content.
If you are having trouble with the pen, try the archived copy on GitHub
Reveal Breadcrumbs on Hover Snippet
See the Pen Collapsed breadcrumbs by Skye (@fraddski) on CodePen.0