Complex sentence: Ali ibn Mousa al-Ridha was at the top of the scientists of his time in medical science, and his treatise in medicine is regarded as most precious Islamic literature in the science of medicine, hence it has been called the Golden Dissertation.
Split into simpler sentences: Ali ibn Mousa al-Ridha was at the top of the scientists of his time in medical science. His treatise in medicine is regarded as most precious Islamic literature in the science of medicine, hence it has been called the Golden Dissertation.