Complex sentence: Minogue also collaborated with Jason Donovan for the song "Especially for You", which peaked at number-one in the United Kingdom and in December 2014 sold its one millionth copy in the UK.
Split into simpler sentences: Minogue also collaborated with Jason Donovan for the song "Especially for You". It peaked at number-one in the United Kingdom and in December 2014 it sold its one millionth copy in the UK.