Complex sentence: A month later, Nyerere declared that to further the interests of national unity and economic development, TANU was now the only legal political party, perhaps partially because the country had effectively been a one-party state since independence.
Split into simpler sentences: A month later, Nyerere declared that to further the interests of national unity and economic development, TANU was now the only legal political party. However, the country had effectively been a one-party state since independence.