Complex sentence: India's population has exceeded that of the entire continent of Africa by 200 million people; however, since Africa's population growth is nearly double that of India, it is expected to surpass both China and India by 2025.
Split into simpler sentences: India's population has exceeded that of the entire continent of Africa by 200 million people. However, because Africa's population growth is nearly double that of India, it is expected to surpass both China and India by 2025.