Complex sentence: The team finished runners-up in the Calcutta Football League, a dismal tenth in the I-League, were crowned Champions in the Airlines Cup after Mohammedan refused to play the finals and gave a walkover.
Split into simpler sentences: The team finished runners-up in the Calcutta Football League and a dismal tenth in the I-League. They were crowned Champions in the Airlines Cup after Mohammedan refused to play the finals and gave a walkover.