lähettäneensä

"lähettäneensä" is a Finnish word, specifically the past active participle of the verb "lähettää" (to send) in the translative case, ending in "-nsä". This grammatical construction signifies that the subject of the verb has sent something, and the "-nsä" suffix indicates possession or a reflexive action, meaning "having sent themselves" or "having sent their own thing". However, it is more commonly used to express "that they had sent" or "having sent" in a subordinate clause, often when reporting or referring to a past action performed by someone else.

The word "lähettäneensä" is a compound form derived from the past active participle "lähettänyt" and the third-person possessive suffix "-nsä". The translative case ending "-nsä" in this context functions similarly to a conjunction, introducing a clause that describes the action of sending. For example, in a sentence like "Hän sanoi lähettäneensä kirjeen" (He said that he had sent a letter), "lähettäneensä" conveys the completed action of sending within the reported speech. The construction is a complex but common feature of Finnish grammar, used for conciseness and to embed reported actions within sentences. It is not typically used as a standalone word but as part of a larger sentence structure.