Complex sentence: Faster acting rodenticides give veterinarians little time to intervene if an animal has ingested it, and, unlike anticoagulants (which can be treated with vitamin K), often have no diagnostic test and no antidote.
Split into simpler sentences: Faster acting rodenticides give veterinarians little time to intervene if an animal has ingested it. And unlike anticoagulants, which can be treated with vitamin K, often have no diagnostic test and no antidote.