You can add multiple .Truncate-text items in the same row and they will truncate evenly. If you want to make one of the items the primary text that doesn't truncate first, add the class .Truncate-text--primary class.
.Truncate-text--primary doesn't need to be the last item in the list or only have one instance. Consider this breadcrumb example where we want to highlight the Repository name and the Issue title. The rest of the breadcrumb will truncate and leave the name and title untruncated until we run out of space.