Complex sentence: All students wear a uniform similar to cadet officers in military academy in academic hours, shorts sleeves in afternoon games and sports, and long sleeves with tie, that is effectively a strip of the college colors, during their evening activities.
Split into simpler sentences: All students wear a uniform similar to those of cadet officers in military academy in academic hours. This consists of short sleeves in afternoon games and sports, and long sleeves with a tie, which is effectively a strip of the college colors, during their evening activities.