Complex sentence: On the campus, the three divisions of the school (Lower, Middle, and Upper Schools) have their own buildings; all classrooms are equipped with SMART Board interactive whiteboards.
Split into simpler sentences: On the campus, the three divisions of the school (Lower, Middle, and Upper Schools) have their own buildings. Some classrooms in the Lower School and all classrooms in the Middle and Upper Schools are equipped with SMART Board interactive whiteboards.