(Clinton skillfully augmented this process by pacing any admissions he has been forced to make, so that each new one was just a small accretion on a large pile of old news.)
Clinton was skillful in augmenting this process by pacing the admissions he was forced to make so each one was a small accretion onto old news.
Clinton was unskillful in augmenting this process by not pacing the admissions he was forced to make.