CANNES, France — A month before Kevin Costner puts the first installment of his multi-chapter Western “Horizon: An American Saga” into theaters, the actor-director came to the Cannes Film Festival to unveil his self-financed passion project. That’s on display in the wide-ranging epic “Horizon,” with a cast including Sienna Miller, Abbey Lee, Sam Worthington and Costner. If I was watching …
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