Complex sentence: Both mines were closed in 1943, due to the, and by the end of the Eniwa Mine's operations, a total of 700 kg of gold and 3,500 kg of silver had been mined.
Split into simpler sentences: Both mines were closed in 1943, due to the. By the end of the Eniwa Mine's operations, a total of 700 kg of gold and 3,500 kg of silver had been mined.