Complex sentence: Glikos was signed by PAOK in 2007 from Gamma Ethniki side Olympiakos Volou, as PAOK's manager Fernando Santos needed an extra keeper for the upcoming season.
Split into simpler sentences: Glikos was signed by PAOK in 2007 from a 3rd division club Olimpiakos Volou. PAOK coach Fernando Santos needed an extra keeper for the upcoming season.