Complex sentence: Arriving at school, Jim immediately gets in hot water for unknowingly stepping on the school insignia, and while shunned by most all of the student body he befriends Plato, who comes to idolize Jim as a father figure.
Split into simpler sentences: Arriving at school, Jim immediately gets in hot water for unknowingly stepping on the school insignia. While shunned by most of the student body, Jim befriends Plato, who comes to idolize him as a father figure.