Complex sentence: Thus, the desire to visit Chidambaram grew in Nandanar to a great extent that he started pestering the Brahmin to grant him permission to visit Chidambaram at least once.
Split into simpler sentences: Thus, the desire to visit Chidambaram grew in Nandanar to a great extent. He started pestering the Brahmin to grant him permission to visit Chidambaram at least once.