Complex sentence: BCF admits that most dinosaurs found are large and very derived in morphology compared to a hypothetical flying ancestor, and it also accepts the results of cladistic analysis connecting these large species into a cladogram, suggesting that the intermediate forms were also large.
Split into simpler sentences: BCF admits that most dinosaurs found are large and very derived in morphology compared to a hypothetical flying ancestor. However, and it also accepts the results of cladistic analysis connecting these large species into a cladogram, suggesting that the intermediate forms were also large.