Complex sentence: Yoga as exercise or alternative medicine is a modern phenomenon which has been influenced by the ancient Indian practice of Yoga and involves holding stretches as a kind of low-impact physical exercise, and is often used for therapeutic purposes.
Split into simpler sentences: Yoga as exercise or alternative medicine is a modern phenomenon which has been influenced by the ancient Indian practice of Yoga. It involves holding stretches as a kind of low-impact physical exercise, and is often used for therapeutic purposes.