Complex sentence: The remaining branch went extinct in the male line in 1740 with the death of Holy Roman Emperor Charles VI and completely in 1780 with the death of his eldest daughter, Maria Theresa, and was succeeded by the Vaudemont branch of the House of Lorraine.
Split into simpler sentences: The remaining branch went extinct in the male line in 1740 with the death of Holy Roman Emperor Charles VI and completely in 1780 with the death of his eldest daughter, Maria Theresa. It was succeeded by the Vaudemont branch of the House of Lorraine.