Original sentence: A number of Greek nationalists dogmatically believe that the modern Greeks are pure descendants of the Ancient Greeks; on the other extreme are those that believe that the Ancient Greeks genetically disappeared at some point in time (for example, see Jakob Philipp Fallmerayer)
Edited sentence: Many Greek nationalists dogmatically believe that the modern Greeks are pure descendants of the Ancient Greeks; on the other extreme are those that believe that the Ancient Greeks genetically disappeared at some point in time (for example, see Jakob Philipp Fallmerayer)