Complex sentence: Blushing refers to the involuntary reddening of a person's face due to embarrassment, anger, or emotional stress in general, though it has been known to come from being lovestruck, or from some kind of romantic stimulation.
Split into simpler sentences: Blushing refers to the involuntary reddening of a person's face due to embarrassment, anger, or emotional stress in general. It has also been believed to come from being lovestruck, or from some kind of romantic stimulation.