Complex sentence: Charles Astor Bristed (October 6,1820-January 15,1874), was an American scholar and author, sometimes writing under the nom de plume "Carl Benson," who was the first American to write a full-length defense of Americanisms.
Split into simpler sentences: Charles Astor Bristed (October 6,1820-January 15,1874), was an American scholar and author, sometimes writing under the nom de plume Carl Benson. He was the first American to write a full-length defense of Americanisms.