Original sentence: Fritz, one of Leonhard Seppala's lead dogs which partnered the legendary Togo (the forgotten hero of the "Great Race of Mercy") , is preserved and on display at the Carrie M.Seppala ran the penultimate, and longest, leg of the 1925 serum run to Nome
Edited sentence: Fritz, one of Leonhard Seppala's lead dogs which partnered with the legendary Togo (the forgotten hero of the "Great Race of Mercy") , is preserved and on display at the Carrie M.Seppala ran the longest, and most dangerous, leg of the 1925 serum run to Nome