Original: The line of the counts of Geneva ended in 1394, and the House of Savoy came into possession of their territory, assuming after 1416 the title of Duke.
Simplified: The last Count of Geneva died in 1394, and the House of Savoy took over their land. In 1416 the counts became dukes, and kept trying to bring the city of Geneva under their control, often by making members of their own family to Bishops of Geneva.