Complex sentence: The Zoroastrian new year, celebrated in the homelands of Zoroastrianism, corresponding to modern-day Iran and Azerbaijan on the Spring Equinox (20 or 21 March), and on Wednesday nights during the earlier weeks of March.
Split into simpler sentences: The Zoroastrian new year, celebrated in the homelands of Zoroastrianism, corresponding to modern-day Iran and Azerbaijan. Novruz falls on the Spring Equinox (20 or 21 March), and celebrations associated with Novruz are also held on Wednesday nights during the earlier weeks of March.