Original sentence: 300 BC in a Maga Brahmin family was one of the principal contributors to the ancient art and science of Ayurveda,  a system of medicine and lifestyle thought to be developed about 5000 years ago in Ancient India
Edited sentence: 300 BC in a Maga Brahmin family was one of the principal contributors to the ancient art and science of Ayurveda,  a system of medicine and lifestyle developed in Ancient India