Complex sentence: Girls Aloud reunited for the group's 10th anniversary and on 18 November 2012, they released their new single, "Something New" which was the official charity single for Children in Need.
Split into simpler sentences: Girls Aloud reunited for the group's 10th anniversary. On 18 November 2012, the group released their new single, "Something New" which was the official charity single for Children in Need.