Complex sentence: While their number dwindled in later years when domestic connections became more commonplace, there are still approximately 2,500 to 2,800 nasoni in all of Rome today, one tenth of them in the historical center.
Split into simpler sentences: While their number dwindled in later years when domestic connections became more commonplace, there are at least half as many still in existence. Today there are approximately 2,500 to 2,800 nasoni in all of Rome, one tenth of them in the historical center.