Täjensivät
Täjensivät is a Finnish verb in the past tense, plural form. It translates to "they supplemented," "they added to," or "they filled." The verb from which it derives is "täjentää," meaning "to supplement," "to add to," or "to fill up." This can refer to physically adding something to a container or space to make it full, or metaphorically to augmenting or enhancing something with additional elements.
The usage of "täjensivät" implies that a group of people or entities performed an action of supplementing.