Complex sentence: Months later, a still-amnesiac Ethan stops by the library to visit Amma before leaving for a college campus tour with Link and apologizes to Lena for not having gotten to know her during their time in Gatlin.
Split into simpler sentences: Months later, a still-amnesiac Ethan stops by the library to visit Amma before leaving for a college campus tour with Link. He apologizes to Lena for not having gotten to know her during their time in Gatlin.