Complex sentence: After research on bodies found in the soil, the Cylons and Dr. Baltar conclude that the organic remains are not Human, but Cylon in origin, and the mechanical Cylon remains resemble older models known to the rebel Cylons but are of a kind unknown to them.
Split into simpler sentences: After research on bodies found in the soil, the Cylons and Dr. Baltar conclude that the remains are not Human, but Cylon in origin. The rebel Cylons futher state that the mechanical Cylon remains resemble older models of theirs but are of a kind unknown to them.