Complex sentence: For the issue dated March 7,2015, "Living for Love" became Madonna's 44th number-one song on the chart, tying her with country singer George Strait as the act with most number-one singles on any "Billboard" chart.
Split into simpler sentences: For the issue dated March 7,2015, "Living for Love" became Madonna's 44th number-one song on the chart. She equaled George Strait--who collected 44 chart-toppers on the Hot Country Songs--as the act with most number-one singles on any "Billboard" chart.