Complex sentence: On 1 August 2014, Nsue joined English Football League Championship club Middlesbrough, signing a three-year contract as a free agent--he was signed by Aitor Karanka, who knew him from the Spanish youth set-up.
Split into simpler sentences: On 1 August 2014, Nsue joined English Football League Championship club Middlesbrough, signing a three-year contract as a free agent. He was signed by Aitor Karanka, who knew him from the Spanish youth set-up.