Complex sentence: Optimism became reality as Baltimore continued their on-field dominance from the previous season by finishing with a 15--3 regular season record--first place in the South Division, and tying the Calgary Stampeders for the best record in the CFL.
Split into simpler sentences: Optimism became reality as Baltimore continued their on-field dominance from the previous season. They ultimately finished with a 15--3 regular season record--first place in the South Division, and tying the Calgary Stampeders for the best record in the CFL.