Complex sentence: According to the accords, Vietnam would be divided for two years until 1956 with the 17th Parallel as the temporary border line when a vote based on universal suffrage would be held to establish a unified Vietnamese government.
Split into simpler sentences: According to the accords, Vietnam would be divided for two years until 1956. The 17th Parallel would act as the temporary border until a vote based on universal suffrage was held to establish a unified Vietnamese government.