Complex sentence: First thing that must be said, is that In-N-Out burger is the best cheeseburger "joint" in all of the southwest United States, although their fries are only delicious when they have fresh oil to cook them in.
Split into simpler sentences: First thing that must be said, is that In-N-Out burger is the best cheeseburger "joint" in all of the southwest United States. Although their fries are only delicious when they have fresh oil to cook them in.