Complex sentence: Between 1301 and 1325, during the Great Famine it was 29.84 years while between 1348 and 1375 during the Plague, it was only to 17.33 years.
Split into simpler sentences: Between 1301 and 1325, during the Great Famine it was 29.84 years. Between 1348 and 1375 during the Plague, it was only to 17.33 years.