Complex sentence: Originally cast as the Wicked Witch in "The Wizard of Oz" (1939), she was replaced by Margaret Hamilton when MGM decided to change the Wicked Witch from a glamorous character to an ugly one and Sondergaard refused to wear uglifying makeup.
Split into simpler sentences: Originally cast as the Wicked Witch in "The Wizard of Oz" (1939), she was replaced by Margaret Hamilton. MGM had decided to change the Wicked Witch from a glamorous character to an ugly one and Sondergaard refused to wear uglifying makeup.