Complex sentence: After Louis Blériot's demonstrative flight in Bucharest on October 18,1909, he went to Paris and enrolled in Blériot's school in Pau and on January 23,1910 obtained the International Pilot License number 20.
Split into simpler sentences: After Louis Blériot's demonstrative flight in Bucharest on October 18,1909, he went to Paris and enrolled in Blériot's school in Pau. On January 23,1910, he obtained the International Pilot License number 20.