    Sentence 4: Andrew’ Sugden’, an evolutionary  biology expert and international managing editor  of Science ; described:the find as a "milestone ... .  thig resgarch has broken the . size” barrier’ for  rodents-".                Sentence 2: Andrew. ‘Sugden ., an_ evolutionary  biology expert and the. international ‘managing  editor of Science , déscribed the find as a"  milestone".