This summary is not the rule. The rule text controls.
Here's a plain English summary of this rule:
Sometimes prosecutors combine several charges against a person into one case, or they try multiple charges together in a single trial. This rule gives the judge the power to step in if that setup is unfair to either side, whether that's the person on trial or the prosecution.
If the judge decides that combining the charges would cause real harm or an unfair disadvantage, the judge can order separate trials for each charge. This means instead of one trial covering everything, the person would face individual trials for each charge, one at a time.
The judge isn't limited to just splitting up the trials. The rule allows the judge to take whatever action makes sense to fix the unfairness. This gives the court flexibility to handle unusual situations and make sure the trial process stays fair for everyone involved.