Complex sentence: At audition his manifest talent, coupled with self-assurance and ambition, both awed and perplexed the judges, with his eventual mentor Dannii Minogue giving the only "no" vote.
Split into simpler sentences: At audition his manifest talent, coupled with self-assurance and ambition, both awed and perplexed the judges. His eventual mentor Dannii Minogue gave the only "no" vote.