Complex sentence: On 21st June 2015 (World Music Day), World Citizen Artists celebrated its first Anniversary in partnership with International Day of Peace, the Bataclan Café (attached to the famous venue "The Bataclan"), and Playing for Change Foundation.
Split into simpler sentences: On 21st June 2015 (World Music Day), World Citizen Artists celebrated its first anniversary. The event was in partnership with the International Day of Peace, the Bataclan Café (attached to the famous venue "The Bataclan"), and Playing for Change Foundation.