Complex sentence: Sestak insisted he would not make a final decision for several months, but on May 4 met with Andy Stern, president of the Service Employees International Union, which fueled speculation that he was seeking labor support for a campaign.
Split into simpler sentences: Sestak insisted he would not make a final decision for several months. On May 4 met with Andy Stern, president of the Service Employees International Union, which fueled speculation that he was seeking labor support for a campaign.