Complex sentence: Kochi also rub these cleaned shoots with coarse salt-nigari blend, and it is alleged (though no authority is cited) that the magnesium of the "nigari" binds with the oxalic acid thus mitigating its hazard.
Split into simpler sentences: Kochi also rub these cleaned shoots with coarse salt-nigari blend. It is said (though no authority is cited) that the magnesium of the "nigari" binds with the oxalic acid thus mitigating its hazard.