Complex sentence: It has been argued that because crabs can autotomise (self-amputate) their claws, manual declawing along these natural fracture planes will not cause pain, however, a lack or reduction of pain during autotomy remains to be verified.
Split into simpler sentences: It has been argued that because crabs can autotomise (self-amputate) their claws, manual declawing along these natural fracture planes will not cause pain. However, a lack or reduction of pain during autotomy remains to be verified.