Complex sentence: Alvez played for Esteghlal Ahvaz for four years until he was purchased by newly promoted Iranian Premier League side Mes Kerman in which he has played a crucial role in the Persian Gulf Cup (2006-2007) season.
Split into simpler sentences: Alvez played for Esteghlal Ahvaz for four years until he was purchased by newly promoted Iranian Premier League. He then in 2006 transferred to newly promoted Iranian Premier League side Mes Kerman in which he has played a crucial role in the Persian Gulf Cup (2006-2007) season.