Complex sentence: Milliken Mills students went to school from 8:00 am to 12:00 pm and the regular students of Unionville High School went to school from 1:00 pm to 4:30 pm.
Split into simpler sentences: Milliken Mills students when to school from 8:00 am to 12:00 pm. After which the regular student of Unionville High School went to school from 1:00 pm to 4:30 pm.