Complex sentence: Izumi Isozaki is two years younger than the other characters, and is very much like Itsuki Akiba, however, she isn't as shy in expressing her emotions, especially her love for Ichitaka Seto.
Split into simpler sentences: Izumi Isozaki is two years younger than the other characters and is very much like Itsuki Akiba. However, she isn't as shy in expressing her emotions, especially her love for Ichitaka Seto.