Complex sentence: Aphthous stomatitis (also termed recurrent aphthous stomatitis, recurring oral aphthae or recurrent aphthous ulceration) is a common condition characterized by the repeated formation of benign and non-contagious mouth ulcers (aphthae), in otherwise healthy individuals.
Split into simpler sentences: Aphthous stomatitis (also termed canker sores, recurrent aphthous stomatitis, RAS, recurring oral aphthae and recurrent aphthous ulceration) is a common cause of benign and non-contagious mouth ulcers, (also called canker sores or aphthae). This condition is characterized by the repeated formation of ulcers in the mouth, in otherwise healthy individuals.