Complex sentence: Dunninger was a good friend to many notables in the magic cummunity including Harry Houdini, Francis Martinka and The Shadow author Walter B. Gibson, he is said to have been a model for The Shadow.
Split into simpler sentences: Dunninger was a good friend to many notables in the magic community including Harry Houdini, Francis Martinka and The Shadow author Walter B. Gibson. He is said to have been a model for The Shadow.