Complex sentence: In the Final Act, she causes grief and great sadness to him when she dies so in a way, Rin brings out the best in Sesshomaru who never shows to other people his feelings for Rin, but he does have them.
Split into simpler sentences: In the Final Act, she causes grief and great sadness to him when she dies so in a way, Rin brings out the best in Sesshomaru. Sesshomaru never shows to other people his feelings for Rin, but he does have them.