Complex sentence: On August 29,2006, Sullivan announced he would be leaving Search Engine Watch on November 30,2006, he later came to an agreement with Jupitermedia to continue participating in SES through 2007.
Split into simpler sentences: On August 29,2006, Sullivan announced he would be leaving "Search Engine Watch" on November 30,2006. He later came to an agreement with Jupitermedia to continue participating in SES through 2007.