Simplify the following text for a Grade 12 native English-speaking person.
Original: These developments â '' re-evaluation of the entire Western value system ( love , marriage , popular culture , shift from industrial to service economy ) that took place since the 1950s and 1960s , with a peak in the Social Revolution of 1968 â '' are described with the term Postmodernity , as opposed to Postmodernism , a term referring to an opinion or movement .
Simplified: These developments were a re-evaluation of the entire Western value system : ( love , marriage , popular culture , and a shift from industrial to service economy ) . All that took place since the 1950s and 1960s , and are described with the term Postmodernity , as opposed to Postmodernism , a term referring to an opinion or movement .