Simplify the following text for a Grade 6 native English-speaking person.
Original: Starting his career as a child actor in his uncle Nasir Hussain 's film Yaadon Ki Baaraat ( 1973 ) , Khan began his professional career eleven years later with Holi ( 1984 ) and had his first commercial success with Qayamat Se Qayamat Tak ( 1988 ) .
Simplified: Khan first appeared in Yaadon Ki Baaraat ( 1973 ) as a child actor . His first big starring role was in Qayamat Se Qayamat Tak ( 1988 ) .