Complex sentence: In 1866, the Association for the Extension of the Contagious Diseases Acts was established and was just as prominent in the publishing of pamphlets and articles as the Ladies National Association for the Repeal of the Contagious Diseases Acts was.
Split into simpler sentences: In 1866, the Association for the Extension of the Contagious Diseases Acts was established. They were just as prominent in the publishing of pamphlets and articles as the Ladies National Association for the Repeal of the Contagious Diseases Acts was.