Complex sentence: Conversely, Buck's next master, John Thornton and his two companions, are described as "living close to the earth" and keep a clean camp, treat the animals well and represent man's nobility in nature.
Split into simpler sentences: Conversely, Buck's next masters, John Thornton and his two companions, are described as "living close to the earth". They keep a clean camp, treat their animals well, and represent man's nobility in nature.