Complex sentence: With the development and growth of transatlantic air traffic Cobh lost its importance as a mail and passenger centre and a significant part of the train station remained largely unused until the opening of the Cobh Heritage Centre in the front part of the station in the 1980s.
Split into simpler sentences: With the development and growth of transatlantic air traffic Cobh lost its importance as a mail and passenger centre. A significant part of the train station remained largely unused until the opening of the Cobh Heritage Centre in the front part of the station in the 1980s.