Complex sentence: While in the case of cryptic species; the mutant SBFs of a new species are suposidly distinct and incompatible, this would probably be preventing the new (cryptic) species from interbreeding with its parental species.
Split into simpler sentences: While in the case of cryptic species; the mutant SBFs of a new species are suposidly distinct and incompatible. This incompatibility would, probably be preventing the new (cryptic) species from interbreeding with its parental species.