Complex sentence: As of May 2015 the CENC is a collaboration between thirteen organizations including six universities, three non-profit research organizations, four VA medical centers, and a military medical center, although sites continue to change as new studies are added, or other studies become completed.
Split into simpler sentences: As of May 2015 the CENC is a collaboration between thirteen organizations including six universities, three non-profit research organizations, four VA medical centers, and a military medical center. Sites continue to change as new studies are added, or other studies become completed.