I wonder what a good strategy would be for a prosecutor in such a case. Can they split the trial into several? Let's say one for using a silencer on a gun in Ne

I wonder what a good strategy would be for a prosecutor in such a case. Can they split the trial into several? Let's say one for using a silencer on a gun in New York City. This is a felony. The murder is clearly another one. Maybe the first should be tried in a state court, while the second in federal (the perpetrator traveled across state lines to carry the hit, on a victim who was also coming from a different state, so this might be a federal case?).