Complex sentence: Between 1885 and 1983 Walkden lay in the now defunct Farnworth constituency and before that, from 1868 to 1885, within the South East Lancashire constituency.
Split into simpler sentences: Between 1885 and 1983 Walkden lay in the now defunct Farnworth constituency. Prior to that, from 1868 to 1885, it lay within the South East Lancashire constituency.