Complex sentence: Sheikh Mudarris retired from official duties in 1973, but continued teaching after the death of Sheikh Najm al-Din al-Wa’iz, he was appointed as the head of the "Ulama" League of Iraq.
Split into simpler sentences: Sheikh Mudarris retired from official duties in 1973, but continued teaching. After the death of Sheikh Najm al-Din al-Wa’iz, he was appointed as the head of the "Ulama" League of Iraq.