Complex sentence: Alaina was selected (along with Imagine Dragons) by ESPN to write and record a promotional single for their college football campaign; her contribution, "History", was released on August 31,2015 and serves as the first promotional single from the album.
Split into simpler sentences: Alaina was selected by ESPN to write and record a promotional single for their college football campaign. Her contribution, "History", was released on August 31,2015 and serves as the first promotional single from the album.