Complex sentence: The recent invitation from U.S. authorities was limited, only open to three of the five committee members, and the visitors would have to agree to refrain from any efforts to speak with any of the detainees.
Split into simpler sentences: The recent invitation from U.S. authorities was limited, only open to three of the five committee members. And the visitors would have to agree to refrain from any efforts to speak with any of the detainees.