Complex sentence: But the overall mediocrity of the Cardinals, combined with stadium issues, caused game attendance to dwindle, and once again the Bidwills, the family that owned the Cardinals, decided to move the team.
Split into simpler sentences: But the overall mediocrity of the Cardinals, combined with stadium issues, caused game attendance to dwindle. And once again the Bidwills, the family that owned the Cardinals, decided to move the team.