Question

how was xuanzang changed by the journey to the west

Answer 1

To my best of knowledge my answer is Xuanzang, the main character, is a monk who is sent on a pilgrimage. At the end of his journey, he achieves Buddhahood, which would be described as the perfection of knowledge and wisdom. Sun Wukong, is a disciple in the form of a monkey. 
Hoped I Helped!

Answer 2

Answer:

Xuanzang is changed by his journey as pilgrims to the west according to his capacity for illumination. He was designed to serve as spiritual type representing one of the stages of Buddhist enlightenment. The illumination or enlightenment is measured by selflessness which means separation from worldly physical goods and bodily attachments in favor of devotion to the way of enlightenment.