Complex sentence: He is most known for directing and producing some of Bollywood's highest grossing films in India and the overseas, the four films he has directed, all starting Shahrukh Khan, have been India's highest grossing productions overseas.
Split into simpler sentences: He is most known for directing and producing some of Bollywood's highest grossing films in India and the overseas. The four films he has directed, all starring Shahrukh Khan, have been India's highest grossing productions overseas.