Complex sentence: On May 28,2002 Cornerstone broke ground on its new location which is on the east side of Bloomington, and on December 1st, 2003, students attended their first day at their new school.
Split into simpler sentences: On May 28,2002 Cornerstone broke ground on its new location which is on the east side of Bloomington. On December 1st, 2003, students attended their first day at their new school.