Simplify the following text for a Grade 12 native English-speaking person.
Original: In 1903 he received the Nobel Prize in Physics with his wife , Maria Salomea SkÅ odowska-Curie , and Henri Becquerel , `` in recognition of the extraordinary services they have rendered by their joint researches on the radiation phenomena discovered by Professor Henri Becquerel '' .
Simplified: He shared the 1903 Nobel Prize in Physics with his wife , Marie Curie and Henri Becquerel , for the work on ` spontaneous radioactivity ' which Becquerel discovered .