Complex sentence: Since Ryūji spends a lot of time with Taiga, he has opened up to her world and to a side of her that most people do not see the two also try to help each other improve the way people view them.
Split into simpler sentences: Since Ryūji spends a lot of time with Taiga, he has opened up to her world and to a side of her that most people do not see. The two also try to help each other improve the way people view them.