Complex sentence: Under the new policy, only certificates received after January 1,2011 will need to be renewed every 3 years; however, a certain amount of documented hours geared towards use of the certification will automatically renew the certification.
Split into simpler sentences: Under the new policy, only certificates received after January 1,2011 will expire after 3 years. Certificates received after January 1,2011 will need to be renewed every 3 years; however, a certain amount of documented hours geared towards use of the certification will automatically renew the certification.