どうやら（〜ようだ）
It seems, apparently (I gather)machine translation
Formationどうやら + clause ending in ようだ／らしい
どうやら is an adverb that signals right from the start of the sentence that what follows is only a GUESS: どうやら雨が降り出したようだ (it seems it has started raining). It almost always pairs with ようだ or らしい at the end of the sentence — you learned both at N4; どうやら simply stands in front to "frame" the whole sentence with a conjectural tone.
Position: at the start of the conjecture clause. どうやら + ようだ when inferring from your own observation (seeing the wet road → どうやら雨が降ったようだ), どうやら + らしい when inferring from information you've heard. A loose Vietnamese rendering is "hình như… thì phải" ("it seems… I suppose").
With どうやら, a conjecture sentence sounds noticeably more natural and rhythmic — the listener knows in advance that this is not an assertion. This is the kind of "paired adverb" construction the N3 exam loves to test: if you see どうやら at the start, the end of the sentence must be a conjectural form, not an ordinary assertion.
Examples
どうやら雨が降り出したようだ。
It seems it has started raining.
どうやら私は道を間違えたらしい。
It looks like I've taken the wrong road.
どうやら隣の部屋には誰もいないようです。
It seems there's no one in the room next door.