Complex sentence: NCOC is made up of seven companies consisting of KazMunayGas, Eni, ExxonMobil, Royal Dutch Shell, Total S.A., China National Petroleum Corporation and Inpex.
Split into simpler sentences: NCOC is made up of seven companies. The Agreement is made up of 7 companies consisting of KazMunayGas, Eni, ExxonMobil, Royal Dutch Shell, Total S.A., China National Petroleum Corporation and Inpex.