pratipattir yato bhavet

nirbhinne-thus being separated; asvinau-the dual Asvinis; nase-of the two nostrils; visnoh-of the Lord; avisatam-entering; padam-post; ghranena amsena-by partially smelling; gandhasya-aroma; pratipattih-experience; yatah-whereupon; bhavet-becomes.