Simplify the following text for a Grade 12 native English-speaking person.
Original: No new notable research or theory on the subject appeared until 1924 , when Alexander Oparin reasoned that atmospheric oxygen prevents the synthesis of certain organic compounds that are necessary building blocks for the evolution of life .
Simplified: No real progress was made until 1924 when Aleksandr Ivanovich Oparin reasoned that atmospheric oxygen prevented the synthesis of the organic molecules . Organic molecules are the necessary building blocks for the evolution of life .