Complex sentence: The cross-section of the basin is asymmetric and its depositional center lies close to the Tian Shan orogenic belt, the sediment thickness thinned towards the Tarim craton.
Split into simpler sentences: The cross-section of the basin is asymmetric and its depositional center lies close to the Tian Shan orogenic belt. The sediment thickness thinned towards the Tarim craton.