Simplify the following text for a Grade 9 native English-speaking person.
Original: In 1943 he received Spain 's National Prize for Orchestra for Cinco piezas infantiles ( `` Five Children 's Pieces '' ) , based on his earlier composition of the same piece for two pianos , premiered by Ricardo ViÃ es .
Simplified: In 1925 he received Spain 's National Prize for Orchestra for his pieces Cinco piezas infantiles ( Five Children 's Pieces ) .