Complex sentence: However, hundreds of thousands of his followers are still present in the very far-flung and most remote areas of Pakistan, who are practising his teachings in its entirety and who are the custodians of his works and teachings five centuries later.
Split into simpler sentences: However, hundreds of thousands of his followers are still present in the most remote areas of Pakistan. They practise his teachings and are still the custodians of his works and teachings five centuries later.