Complex sentence: Due to the change in size of the student body and location, Cranford'sdecision to leave the Watchung Conference for the Mountain Valley Conference was approved in 2006 and Cranford began competition in most sports in the 2006-07 school year, remaining there until the 2010 realignment.
Split into simpler sentences: Due to the change in size of the student body and location, Cranford decided to leave the Watchung Conference for the Mountain Valley Conference. The change was approved in 2006 and Cranford began competition in most sports in the 2006-07 school year, remaining there until the 2010 realignment.