Complex sentence: In 2014, researchers released data studying 5,294 patients from the database and were able to correlate sleep apnea with increased blood sugar; their results were published in the "European Respiratory Journal".
Split into simpler sentences: In 2014, researchers released data studying 5,294 patients from the database and were able to correlate sleep apnea with increased blood sugar. Their results were published in the "European Respiratory Journal".