Complex sentence: Linda Andrews, the veterinarian in Hobson, begins to wonder about the safety of "TX-40" when Old Man Rivers brings in a dead cat from his field that has horrible mutations, including a giant tumor which sprouts a fifth leg.
Split into simpler sentences: Linda Andrews, the veterinarian in Hobson, begins to wonder about the safety of "TX-40" when a farmer brings in a dead cat from his field. The cat has horrible mutations, including a giant tumor which sprouts a fifth leg.