Complex sentence: Buckwheat leaves contain far more fagopyrin than the grain, so this condition primarily occurs in animals that graze buckwheat, but has also been reported from people who eat large amounts of buckwheat sprouts, or drink buckwheat-sprout juice.
Split into simpler sentences: Buckwheat leaves contain far more fagopyrin than the grain, so this condition primarily occurs in animals that graze buckwheat. It has also been reported from people who eat large amounts of buckwheat sprouts, or drink buckwheat-sprout juice.