Complex sentence: Hotelling's rule is the result of analysis of non-renewable resource management by Harold Hotelling, published in the "Journal of Political Economy" in 1931, but a similar result was published by L. C. Gray in 1914, considering the case of a single mine owner.
Split into simpler sentences: Hotelling's rule is the result of analysis of non-renewable resource management by Harold Hotelling, published in the "Journal of Political Economy" in 1931. A similar result was published by L. C. Gray in 1914, considering the case of a single mine owner.