Complex sentence: Soon after his enrollment, he has a fateful meeting with Aika Tenkūbashi, a student who can alternately be shy, stubborn, and/or pretentious, but who is also innocently fascinated by the outside world.
Split into simpler sentences: Soon after his enrollment, he has a fateful meeting with Aika Tenkūbashi. Aika is a student who can alternately be shy, stubborn, and/or pretentious, but who is also innocently fascinated by the outside world.