Each separate incident is a separate crime and they can charge you with each one. The application of the statute of limitations as a defense is something you would need to consult with a criminal attorney about and they would have to review the timeline of events, and any facts that might have tolled (stopped) the statute of limitaitons and given the state extra time to file.
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You should hiire an attorney. They can charge each separate incident as a crime. I would need more details to determine what the applicable statute of kimitations would apply.