Complex sentence: The certificates were signed by Superintendent Landis, and by Rhine R. Freed, Chief Coiner of the Philadelphia Mint, and the coin was placed inside a holder with wax paper window, secured into place with heavy string with that mint's seal.
Split into simpler sentences: The certificates were signed by Superintendent Landis, and by Rhine R. Freed, Chief Coiner of the Philadelphia Mint. The coin was placed inside a holder with wax paper window, secured into place with heavy string with that mint's seal.