Complex sentence: She was an active member of the American Library Association for many years, eventually obtaining membership on the organization's council; and she wrote semi-annual articles for "College & Research Libraries", the first of which appeared in 1951.
Split into simpler sentences: She was an active member of the American Library Association for many years, eventually obtaining membership on the organization's council. And she wrote semi-annual articles for College & Research Libraries, the first of which appeared in 1951.