Original sentence: Blackwill had been mentioned as a possible successor to National Security Advisor Condoleezza Rice in Bush's second term but Blackwill told associates that he had spent six years working for Bush -- two years as a foreign policy adviser to his first presidential campaign, two years as ambassador to India and two years at the White House -- and that the presidential election seemed like a natural end to this cycle in his life
Edited sentence: Blackwill had been mentioned as a possible successor to National Security Advisor Condoleezza Rice in Bush's second term but Blackwill told associates that he had spent six years working for Bush—two years as a foreign policy adviser to his first presidential campaign, two years as ambassador to India and two years at the White House—and that the presidential election seemed like a natural end to this cycle in his life