Complex sentence: Ashwin initially unsuccessfully auditioned for a role in "Vinnaithaandi Varuvaayaa" but was noticed by the assistant directors of the film who recommended him to Gautham Menon for a role in the crime thrille "Nadunissi Naaygal".
Split into simpler sentences: Ashwin initially unsuccessfully auditioned for a role in "Vinnaithaandi Varuvaayaa". But Ashwin was noticed by the assistant directors of the film who recommended him to Gautham Menon for a role in the crime thrille "Nadunissi Naaygal".