Complex sentence: In 1934, it was united with the neighboring Free State of Mecklenburg-Strelitz, both of which, today, is part of the Bundesland Mecklenburg-Vorpommern.
Split into simpler sentences: In 1934, it was united with the neighboring Free State of Mecklenburg-Strelitz. Today, both are part of the Bundesland Mecklenburg-Vorpommern.