Complex sentence: While the root of the controversy was the Tibet issue according to John W. Garver and numerous Chinese sources, the Indian Forward Policy and the failure of negotiations was also important in China's decision to initiate war with India.
Split into simpler sentences: While the root of the controversy was the Tibet issue according to John W. Garver and numerous Chinese sources. The Indian Forward Policy and the failure of negotiations was also important in China's decision to initiate war with India.