Complex sentence: On 17 January 2014 Mitchell's contract with Rangers was terminated by mutual consent and he rejoined Annan on a permanent deal until the end of the 2013/14 season.
Split into simpler sentences: On 17 January 2014 Mitchell's contract with Rangers was terminated by mutual consent. And on the 17th of January 2014 he rejoined Annan on a permanent deal until the end of the 2013/14 season.