Complex sentence: Many of the most minor and little used lines were closed during this period, though some secondary cross country lines were closed as well such as the Midland and Great Northern Joint Railway in East Anglia, which was closed in 1959.
Split into simpler sentences: Many of the most minor and little used lines were closed during this period. However some secondary cross country lines were closed as well such as the Midland and Great Northern Joint Railway in East Anglia, which was closed in 1959.