Task: Translation
Input (English): English sentence: The book contains his early researches on Fourier transforms in the complex domain which had developed from his study of the Paley - Wiener book which began his research career.
Output (Tagalog): Ang libro ay naglalaman ng kanyang unang bahagi ng pananaliksik sa Fourier transforms sa komplikadong domain na kung saan ay binuo mula sa kanyang pag-aaral ng Paley - Wiener libro na kung saan nagsimula ang kanyang karera sa pananaliksik.