Complex sentence: Abiding by his principles, Homer ignores Hud's plea and waits for the veterinarian, who arrives and immediately issues a legally-binding State Livestock Transfer Order directing the Bannon ranch to be quarantined for a possible infection of foot-and-mouth disease.
Split into simpler sentences: Abiding by his principles, Homer ignores Hud's plea and waits for the veterinarian. The order directs that the Bannon ranch be quarantined for a possible infection of foot-and-mouth disease.