Complex sentence: According to Oil & Gas Journal as of January 1,2011, Qatar's proven natural gas reserves stood at approximately 896 TCF, that is almost 14% of all known natural gas reserves and the third-largest in the world behind Russia and Iran.
Split into simpler sentences: According to Oil & Gas Journal, Qatar's proven natural gas reserves stood at approximately 896 TCF as of January 1,2011. Qatar holds almost 14% of total world natural gas reserves and is the third-largest in the world behind Russia and Iran.