Complex sentence: Sahni's wife Damayanti died at a young age in 1947, who was the heroine of his film, "Gudiya" (1947) and two years later he married his first cousin, Santosh Chandhok, later known as an author and television writer.
Split into simpler sentences: Sahni's wife Damayanti, who was the heroine of his film "Gudia", died at a young age in 1947. Two years later, he married his first cousin, Santosh Chandhok, later known as an author and television writer.