Complex sentence: Chatyr Kul (also Chatyr Köl, Chatyrkol) is an endorheic alpine lake in the Tian Shan mountains in southern Kyrgyzstan; it lies in the Ak Sar valley near the Torugart Pass border crossing into China.
Split into simpler sentences: Chatyr Kul (also Chatyr Köl, Chatyrkol) is an endorheic alpine lake in the Tian Shan mountains in southern Kyrgyzstan. The lake lies in the Ak Sar valley not far from the Torugart Pass border crossing into China.