vaktāraścākṛtrimavākyāni ceti dvandvaḥ / tatra vaktāro vedānāṃ vyākhyātāraḥ //
The compound is to be analyzed as "vaktāraḥ" ["expounders"] and "akṛtrimavākyāni" ["eternal sentences"]; here "vaktāraḥ" refers to those who expound the Vedas.