Complex sentence: Gallatin later withdrew from the contest for the vice-presidency, after quickly becoming disillusioned by repeated attacks on his credibility made by the other candidates, and was replaced by North Carolina senator Nathaniel Macon.
Split into simpler sentences: Gallatin later withdrew from the contest for the vice presidency, after quickly becoming disillusioned by repeated attacks on his credibility made by the other candidates. He was replaced by North Carolina senator Nathaniel Macon.