Complex sentence: The Jia-A league achieved huge success in its early years, but heavy criticism also existed towards the managenment practices of the League and some of the member clubs, at the same time, the league was affected with gambling, match-fixing and corruption.
Split into simpler sentences: The Jia-A league achieved huge success in its early years but heavy criticism also existed towards the League's management practices and some of its member clubs. At the same time, the league was affected by gambling, match-fixing and corruption.