Complex sentence: SNTV was once but is no longer used to elect the parliaments of Japan and South Korea, but it is still used in Japan for some seats in the House of Councillors (Sangi-in), prefectural assemblies and municipal assemblies.
Split into simpler sentences: SNTV was once used to elect the parliaments of Japan and South Korea, but its use has been discontinued. It is still used in Japan for some seats in the House of Councillors (Sangi-in), prefectural assemblies and municipal assemblies.