Complex sentence: Eventually, Dr. Chapman finds out that Mary and the kids had been feeding stray dogs; and despite the kids'(especially Cindy's) tearful pleas, Dr. Chapman refuses to let them keep the dogs.
Split into simpler sentences: Eventually, Dr. Chapman finds out that Mary and the kids had been feeding stray dogs. Despite the kids'(especially Cindy's) tearful pleas, Dr. Chapman refuses to let them keep the dogs.