What's the use of "that" in this sentence?
In this moment I'm reading Jane Austen's "Pride and Prejudice."
The well-known sentence, " It is a truth universally acknowledged, that a single man in possession of a good fortune must be in want of a wife."
It is taught that normally "that" cannot be put after the comma, so I'm thinking what's the use of "that" here, making it can be put after the comma. (I feel like it's appositive...)
Thanks for answering me!