Complex sentence: These stones are naturally formed round stones, with circular or spiral markings and are fossil ammonite stones found in the rivers of Himalayas, in particular kinds of ocean sediments, which have been uplifted to the top of the Himalayas.
Split into simpler sentences: These stones are naturally formed round stones, with circular or spiral markings. It is fossil ammonite stone found in the rivers of Himalayas, in particular kinds of ocean sediments, which have been uplifted to the top of the Himalayas.