Add punctuation: By late 1920 Friedmann wrote in a letter to Ehrenfest
A: By late 1920, Friedmann wrote in a letter to Ehrenfest :

Add punctuation: To begin your free file analysis simply draganddrop your TFW file inside the dotted lines below or click Browse My Computer and select your file
A: To begin your free file analysis, simply drag-and-drop your TFW file inside the dotted lines below, or click "Browse My Computer" and select your file.

Add punctuation: Ready for going Ulla was our chauffeur and Jim our Guide
A:
Ready for going. Ulla was our chauffeur, and Jim our Guide.