Complex sentence: He was a delegate to the State constitutional convention in 1821, and in 1825 was appointed one of the commissioners to revise the statutes law of the state, and afforded valuable assistance in the preparation of the first half of the work.
Split into simpler sentences: He was a delegate to the State constitutional convention in 1821. In 1825 he was appointed one of the commissioners to revise the state statutes, and was especially active in preparing the first half of the work.