Complex sentence: In 2012, Shaffer appeared in the 12/12/12 Concert for Sandy Relief, where Shaffer accompanied Adam Sandler, the concert raised money for the people who were affected by Hurricane Sandy in October of 2012.
Split into simpler sentences: In 2012, Shaffer appeared in the 12/12/12 Concert for Sandy Relief, where Shaffer accompanied Adam Sandler. The concert raised money for the people who were affected by Hurricane Sandy in October of 2012.