Complex sentence: The group serves its jail time, and Marc and Rebecca each go into seclusion from the press, never seeing or speaking to each other again, with both of them continuing to blame each other for the robberies.
Split into simpler sentences: The group serves its jail time, and Marc and Rebecca each go into seclusion from the press. They never see or speak to each other again, and both of them steadfastly blame each other for the robberies.