Complex sentence: But this offer, too, was unacceptable to Hungary; also, it was not clear why Rusyns, a would-be minority in both countries, counted as Slovaks in the Slovak proposal.
Split into simpler sentences: But this offer, too, was unacceptable to Hungary. In this aspect, it was not clear why Rusyns, a would-be minority in both countries, counted as Slovaks in the Slovak proposal.