Complex sentence: A quiet girl around the same appearance in age as Tōta and Kurōmaru, Karin Yuuki is very devoted to Yukihime after having been saved by her in the past and is jealous of Tōta's close relationship with her.
Split into simpler sentences: A quiet girl around the same appearance in age as Tōta and Kurōmaru. She is very devoted to Yukihime after having been saved by her in the past and is jealous of Tōta's close relationship with her.