Complex sentence: Parties are expected to watchlist the case page, and to monitor it for status updates; when a mediator takes on a case, he or she will make a note there, and will generally ask that the parties submit some initial information there.
Split into simpler sentences: Parties are expected to watchlist the case page and monitor it for status updates. When a mediator takes on a case, they make a note there, and generally ask the parties to submit initial information there.