Complex sentence: Reading the works of Roudaki, Ferdowsi, Nezami, Saadi, Hafez and Rumi, as soon as he learned to read, set the tone for the rest of his life.
Split into simpler sentences: Reading the works of Roudaki, Ferdowsi, Nezami, Saadi, Hafez and Rumi, as he was learning to read. This set the tone for the rest of his life.