Complex sentence: Weil asserts that obligations are more fundamental than rights, as a right is only meaningful insofar as others fulfil their obligation to respect this right: a man alone in the universe, she says, would have obligations but no rights.
Split into simpler sentences: Weil asserts that obligations are more fundamental than rights, as a right is only meaningful insofar as others fulfil their obligation to respect it. A man alone in the universe, she says, would have obligations but no rights.