Complex sentence: Prior to the 2009--10 season, Henderson had a trial with Turkish Süper Lig side Ankaragücü, and on 27 July 2009, after a successful trial, signed a two year contract until summer 2011.
Split into simpler sentences: Prior to the 2009--10 season, Henderson had a trial with Turkish Süper Lig side Ankaragücü. On 27 July 2009, after a successful trial with the club, he signed a two year contract keeping him at the club until Summer 2011.