Complex sentence: He was a judge of the Vermont Supreme Court in 1833 and 1834; declined to be a candidate for renomination; and became a delegate to the State constitutional convention in 1836.
Split into simpler sentences: He was a judge of the Vermont Supreme Court in 1833 and 1834, and declined to be a candidate for renomination. Mattocks was a delegate to the State constitutional convention in 1836.