Complex sentence: His career in films ran parallel to Dilip Kumar, who was his schoolmate.They made their debut as with the Bombay Talkies film "Pratima", also the directorial debut of actor P. Jairaj.
Split into simpler sentences: His career in films ran parallel to Dilip Kumar, who was his schoolmate. Both of them were in schoolmae, making their debut with the Bombay Talkies film "Pratima", also the directorial debut of actor P. Jairaj.