Complex sentence: 'Neat' in the oil's name comes from an obsolete term for cattle, and even today the best quality neatsfoot oil still comes from the legs of calves, with no other oils added.
Split into simpler sentences: 'Neat' in the oil's name comes from an obsolete term for cattle. Today, many still consider the best quality neatsfoot oil to be that which comes from the legs of calves, with no other oils added.