Complex sentence: Kumar was signed for a lead role by producer Pramod Chakravarthy for the movie "Deedar" but made his first film appearance in the uncredited role of a martial arts instructor in the 1987 Kumar Gaurav starrer film "Aaj".
Split into simpler sentences: Kumar was signed for a lead role by producer Pramod Chakravarthy for the movie "Deedar". Kumar first appeared as a martial arts instructor in the 1987 Kumar Gaurav starrer film "Aaj".