Complex sentence: The Lower Campus (grades K-5) is located at Vancouver's Italian Cultural Centre (until November 09), about 1 km east of the Upper School (grades 6-12), which is located on Commercial Drive.
Split into simpler sentences: The Lower Campus (grades K-5) is located at Vancouver's Italian Cultural Centre. Until November 09, it is located about 1 km east of the Upper School (grades 6-12), which is located on Commercial Drive.