Complex sentence: In 2009, it published its first Hebrew/English prayerbook, The Koren Sacks Siddur, based on The Koren Siddur and with an English introduction, translation, and commentary by Rabbi Jonathan Sacks, Chief Rabbi of the United Hebrew Congregations of the British Commonwealth.
Split into simpler sentences: In 2009, Koren published its first Hebrew/English prayerbook, The Koren Sacks Siddur. This prayer book is based on The Koren Siddur and with an English introduction, translation, and commentary by Rabbi Jonathan Sacks, Chief Rabbi of the United Hebrew Congregations of the British Commonwealth.