Complex sentence: Originally Canterbury played in the Kent League and after some solid campaigns they joined the Metropolitan League for the 1959-60 season where they finished 3rd which was enough to win promotion to the Southern League Division 1 where they soon consolidated.
Split into simpler sentences: Originally Canterbury played in the Kent League and after some solid campaigns they joined the Metropolitan League for the 1959-60 season where they finished Third. This was enough to win promotion to the Southern League Division 1 where they soon consolidated.