Complex sentence: In October 2004, Mudrinić signed a four-year contract with Red Star Belgrade, subsequently winning the double in the 2005--06 season under the guidance of Walter Zenga.
Split into simpler sentences: In October 2004, Mudrinić signed a four-year contract with Red Star Belgrade. He was a member of the team that won the double in the 2005--06 season under the guidance of Walter Zenga.