Complex sentence: It is really hard just like any kid moving and having to go to a different high school, but it is especially hard for Adam because in the book it mentions how people at Honolulu High School hate military kids.
Split into simpler sentences: It is really hard just like any kid moving and having to go to a different high school, but it is especially hard for Adam. I say this because in the book it mentions how people at Honolulu High School hate military kids.