Complex sentence: His mother had taken a trip to see the 1904 St. Louis Exposition, where there was a display of gliders organized by Octave Chanute and, somehow on her return, Tom became more focused on aeronautics.
Split into simpler sentences: His mother had taken a trip to see the 1904 St. Louis Exposition. Where there was a display of gliders organized by Octave Chanute and, somehow on her return, Tom became more focused on aeronautics.