Complex sentence: The production stay in 1913 was 774,000 tonnes, these mine extracted in 1927 about 2,600,000 tonnes for maintain one extraction of 16,800,000 tonnes.
Split into simpler sentences: The production stay in 1913 was 774,000 tonnes. In 1927, these mines extracted about 2,600,000 tonnes for maintain one extraction of 16,800,000 tonnes.