Complex sentence: In 1866 the Carmelites opened the first Catholic church in the district and three years later the parish church of Our Lady of Victories opened on 2 July 1869, the Feast of the Visitation, and became the Pro-Cathedral of the Archdiocese of Westminster.
Split into simpler sentences: In 1866 the Carmelites opened the first Catholic church in the district. The parish church of Our Lady of Victories opened on 2 July 1869, the Feast of the Visitation, and became the Pro-Cathedral of the Archdiocese of Westminster.