Complex sentence: In 1873, publication of the quarterly (monthly from 1883) "Cook's Continental Timetable" began; it continues to be published in 2012, under the title "Thomas Cook European Rail Timetable".
Split into simpler sentences: In 1873, publication of the quarterly (monthly from 1883) "Cook's Continental Timetable" began. It continues to be published in 2012, under the title "Thomas Cook European Rail Timetable".