Complex sentence: Hackett was born to Maurice Hackett and actress Florence Hackett (née Hart) in New York City, New York where he attended Professional Children's School and started out as a child actor, appearing on stage and in films.
Split into simpler sentences: Hackett was born in New York City, New York, the son of actress Florence Hackett (née Hart) and Maurice Hackett. He attended Professional Children's School and started out as a child actor, appearing on stage and in films.