Complex sentence: She held the position of vice-president of Azione Cattolica, the most popular Italian Catholic lay association, from 1984 to 1989, the year she joined the Christian Democracy (DC) party.
Split into simpler sentences: She held the position of vice-president of Azione Cattolica, the most popular Italian Catholic lay association, from 1984 to 1989. In the latter year she entered the Christian Democracy (DC) party.