Complex sentence: It was proposed to banish from France all members of the old "noblesse", and though the proposal was dropped, they were all declared to be foreigners and were forced to obtain naturalisation in order to enjoy the rights of other citizens.
Split into simpler sentences: It was proposed to banish from France all members of the old "noblesse". Although the proposal was dropped, they were all declared to be foreigners and were forced to obtain naturalisation in order to enjoy the rights of other citizens.