Complex sentence: The North Dakota Democratic Party was a political party in North Dakota that existed from the state's formation in 1889 until 1956, when the party merged with the Non Partisan League to form the modern North Dakota Democratic NPL Party.
Split into simpler sentences: The North Dakota Democratic Party was a political party in North Dakota from around 1889 to 1956. In 1956, the party merged with the Non Partisan League to form the modern North Dakota Democratic NPL Party.