Complex sentence: Competitive "karuta" is a one-on-one game, facilitated by a reciter (card reader) and a judge, and official matches will use cards made by "Oishi Tengudo".
Split into simpler sentences: Competitive "karuta" is a one-on-one game, facilitated by a reciter (card reader) and a judge. All official matches use cards made by "Oishi Tengudo".