Complex sentence: Some believe that they are descended from Indo-Chinese stock with some mixture of Aryan blood, while some scholars believe that the Manipuris are the Indo-Aryan Kshatriyas mentioned in the "Mahabharatha".
Split into simpler sentences: Some believe that Manipuris are descended from Indo-Chinese stock with some mixture of Aryan blood. Some scholars believe that the Manipuris are the Indo-Aryan Kshatriyas as mentioned in the "Mahabharatha".