Complex sentence: Once an all males school that emphasized on studies and martial arts to better the students that enrolled there, over time, it has become more of a juvenile delinquent "correctional" center, attracting gangsters and misfits from all over Japan.
Split into simpler sentences: Once an all-males school that emphasized on studies and martial arts to better the students that enrolled there. Over time, it has become more of a juvenile delinquent "correctional" center, attracting gangsters and misfits from all over Japan.