Complex sentence: According to Nobuhiro Watsuki, Misao's character was initially a combination of Kamiya Kaoru and Myojin Yahiko: upon her introduction into the story, she acts somewhat childish and innocent.
Split into simpler sentences: According to Nobuhiro Watsuki, Misao's character was to be a combination of Kamiya Kaoru and Myojin Yahiko. Upon her introduction into the story, she acts somewhat childish and innocent.