Complex sentence: An auditions special aired the day before the main series aired showed some of the highlights and lowlights from the 8,500 audition submissions sent in to the show before officially revealing the 16 people who would compete on the series.
Split into simpler sentences: An auditions special aired the day before the main series aired showed some of the highlights and lowlights from the 8,500 audition submitions sent in to the show. Additionally this program revealed the 16 people who would compete on the series.