Complex sentence: Study sponsor Cell Therapeutics announced that Pixantrone achieved the primary efficacy endpoint, and in April 2009 began a rolling submission of a New Drug Application to the U.S. Food and Drug Administration for Pixantrone to treat relapsed or refractory aggressive NHL.
Split into simpler sentences: Study sponsor Cell Therapeutics announced that Pixantrone achieved the primary efficacy endpoint. A New Drug Application for pixantrone is under review by the U.S. Food and Drug Administration for Pixantrone to treat relapsed or refractory aggressive NHL.