yajñaḥ karma-samudbhavaḥ

annat-from grains; bhavanti-grow; bhutani-the material bodies; parjanyat-from rains; anna-food grains; sambhavah-are made possible; yajnat-from the performance of sacrifice; bhavati-becomes possible; parjanyah-rains; yajnah-performance of yajna; karma-prescribed duties; samudbhavah-born of.