Complex sentence: At the Senior School the school year is broken into semester system, regular classes begin each day at 8:15 a.m. and end at 3:10 p.m., punctuated by a late-morning assembly period.
Split into simpler sentences: At the Senior School, the school year is broken into semester system. Regular classes begin each day at 8:15 a.m. and end at 3:10 p.m., punctuated by a late-morning assembly period.