Complex sentence: Other opponents to this power plant claimed that it had the same design as the Chernobyl--a falsehood, since Chernobyl had RBMKs, and Temelín would have VVERs.
Split into simpler sentences: Other opponents to this power plant claimed that it had the same design as the Chernobyl. In fact, Chernobyl had RBMKs, and Temelín would have VVERs.