Complex sentence: McNamee, a versatile defender, started his career with Scottish club St Mirren, where his impressive performances alerted English Premier League club Blackburn Rovers, who signed him in 1999.
Split into simpler sentences: McNamee, a versatile defender, started his career with Scottish club St Mirren. His impressive performances for St. Mirren alerted Premier League club Blackburn Rovers, who signed him in 1999.