Complex sentence: The film is an adaptation of the Tamil detective novel "Ethir Katru" by Subha which has also been adapted in Tamil cinema as "Ethir Kaatru" (1990).
Split into simpler sentences: The film is an adaptation of the Tamil detective novel "Ethir Katru" by Subha. It was also later adapted in Tamil cinema as "Ethir Kaatru" (1990).