Complex sentence: The fourth month ("shigatsu ") in the Japanese calendar is equivalent roughly to April in the Gregorian calendar, therefore End of March ("yayoijin ") is equal to End of Spring ("haru no hate").
Split into simpler sentences: The fourth month ("shigatsu ") in the Japanese calendar is equivalent roughly to April in the Gregorian calendar. Therefore end of March ("yayoijin ") is equivalent to end of spring ("haru no hate").