Complex sentence: The Patsy Award (Picture Animal Top Star of the Year) was originated by the Hollywood office in 1939 after a horse was killed in an on-set accident during the filming of the Tyrone Power film "Jesse James".
Split into simpler sentences: The Patsy Award (Picture Animal Top Star of the Year) was originated by the Hollywood office in 1939. They decided to honor animal performers after a horse was killed in an on-set accident during the filming of the Tyrone Power film "Jesse James".