It is okay either way. Even you combine the sentences into a main and relative clause, then the past perfect has to be used:
Prior to {having announced | announcing} the JV, the companies declared the intent.
If the declaration of intent long preceded the announcement of the deed, then there is a strong preference for the perfect:
Years before they announced the JV, the companies had already declared the event.
Basically, although the need for the past perfect is usually explained as being connected to a past event which precedes another past event, the real rule is more complicated. Actually, the past-past event must be complete in some sense and not a part of the past event.
Before I did my homework, I checked my favorite websites.
I started my homework right when I got home, since I had already checked my favorite websites on the go.
In the first sentence we have a simple sequential relationship between two past actions: did this then did that. One is more in the past than the other, but grammatically it is all just one past.
In the second sentence, one action is already considered done with respect to the past. We can dispense with "had" in this sentence, but doing so will degrade the quality of the writing, giving it an unsophisticated air of colloquial english.
Perfects are not always strictly mandatory, but they improve the sentence structure by clarifying the temporal relationships among clauses.
In your example, I would go with the perfect if I were writing an article for publication or giving a presentation. In a casual conversation in which I am not minding the quality of my speech so much, I might drop it in favor of the simple past, except in cases where it is glaringly ungrammatical, like:
Standing in that city square, I suddenly had a feeling as if I {was *|were *|have been*|had been} there before.
[In a moment in the past, at a particular place, I felt that in an earlier momen, I had been to that place.]
The past perfect must be used here because "I had a feeling" takes place in the square, and having been in the square is a perfect past relative to that past. Contrast that with:
Standing on top of that tall ridge, I suddenly had a feeling as if I {was ?|were|have been*|had been*} a bird.
[In a moment in the past, I felt that I am a bird (in that same moment, not in a past moment).]
(Was is marked as questionable because the preferred form for "to be" in present tense subjunctives is "were": "If I were rich". In casual speech, it is common to just use "was": "If I was rich".)