Original sentence: Dmitry Sergeyevich Likhachov (, also Dmitri Likhachev or Likhachyov;  – 30 September 1999) was Russian medievalist, linguist, and concentration camp survivor
Edited sentence: Dmitry Sergeyevich Likhachov (, also Dmitri Likhachev or Likhachyov;  – 30 September 1999) was an outstanding Russian medievalist, linguist, and concentration camp survivor