Complex sentence: Until 2006, only representatives of the various postal administrations were entitled to elect the best Europa stamp during the Plenary Assembly of PostEurop, but since 2007, the winner is elected through an open and public voting procedure on the PostEurop website.
Split into simpler sentences: Until 2006, only representatives of the various postal administrations were entitled to elect the best Europa stamp during the Plenary Assembly of PostEurop. Since 2007, the winner is elected through an open and public voting procedure on the PostEurop website.