Simplify the following text for a Grade 5 native English-speaking person.
Original: Several of his books were international bestsellers and inspired successful film adaptations , notably Lost Horizon ( 1933 ) , which won a Hawthornden Prize ; Goodbye , Mr. Chips ( 1934 ) ; and Random Harvest ( 1941 ) .
Simplified: Three of the best known movies are : Lost Horizon ( 1933 ) , Goodbye , Mr. Chips ( 1934 ) , and Random Harvest ( 1941 ) .