Complex sentence: It is a class-IV antiarrhythmic, more effective than digoxin in controlling ventricular rate and was approved by the U.S. Food and Drug Administration (FDA) in March 1982.
Split into simpler sentences: It is a class-IV antiarrhythmic and more effective than digoxin in controlling ventricular rate. It was approved by the U.S. Food and Drug Administration (FDA) in March 1982.