He can't; this isn't an appealable order.
And if he continues to fail to comply with Rule 8 the case can be dismissed with prejudice. Rule 41 says:
Involuntary Dismissal; Effect. If the plaintiff fails to prosecute or to comply with these rules or a court order, a defendant may move to dismiss the action or any claim against it. Unless the dismissal order states otherwise, a dismissal under this subdivision (b) and any dismissal not under this rule—except one for lack of jurisdiction, improper venue, or failure to join a party under Rule 19 —operates as an adjudication on the merits.
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