Complex sentence: In 2013, Brittany Ferries will introduce a new Seasonal Route sailing from Portsmouth-Le Havre-Portsmouth from Friday 17th May until Sunday 8th September but only on Thursdays, Fridays, Saturdays & Sundays.
Split into simpler sentences: In 2013, Brittany Ferries introduced a new Seasonal Route sailing from Portsmouth-Le Havre-Portsmouth beginning on Friday 17th May until Sunday 8th September. The service will run on Thursdays, Fridays, Saturdays & Sundays.