Some people seem to have trouble with the english in the second, so I started writing it in relation to something else to illustrate how the sentence structure works.
A well balanced breakfast, being necessary to the start of a healthy day, the right of the people to keep and eat food shall not be infringed.
So, in the above revision, who would you say has the right to keep and eat food, “the people” or “a well balanced breakfast?” Clearly, as “breakfast” is a concept and incapable of “ownership,” “the people” is the answer. It stays the same gramatically if you plug in “regulated militia” for “balanced breakfast” and “guns” for “food,” the first part is clarifying the reasoning for them delineating the right’s importance, the scond part is delineating the right itself and who has it.
It isn’t saying you’re only allowed to eat breakfast, it’s saying that breakfast is important, and as such, your right to keep food in your fridge/pantry and cook/eat it to your specifications shall not be hampered by the government.