Complex sentence: In a 2013 report, the US Energy Information Administration updated it estimation on China's shale gas reservior that China had 1115 trillion cubic feet of recoverable shale gas, the distribution of these resources was surveyed in the following report-China Shale Gas Development.
Split into simpler sentences: In a 2013 report, the US Energy Information Administration updated it estimation on China's shale gas reservior. It was said that China had 1115 trillion cubic feet of recoverable shale gas, and the distribution of these resources was surveyed in the report-China Shale Gas Development.