Complex sentence: The Arusha Declaration was proclaimed in 1967 by the Tanzanian President Julius Nyerere which aimed to achieve self reliance through nationalising key sectors of the economy such as banks, large industries and plantations were therefore nationalised.
Split into simpler sentences: The Arusha Declaration was proclaimed in 1967 by the Tanzanian President Julius Nyerere which emphasized on self reliance. Key sectors of the economy such as banks, large industries and plantations were therefore nationalised.