Complex sentence: On August 5,2010, Professor de Marco underwent an angioplasty to wide and obstructed heart artery that however developed complications, which led him to go in a critical, but stable condition.
Split into simpler sentences: On August 5,2010, Professor de Marco underwent an angioplasty to widen an obstructed heart artery. The intervention developed complications, which led him to a critical, but stable condition.