Simplify the following text for a Grade 8 native English-speaking person.
Original: It ran for six seasons on ABC , from 1988 through 1993 and each season took place exactly twenty years before the then current year ( thus the show takes place in 1968-73 ) .
Simplified: The Wonder Years was an American situation comedy series which aired on ABC between 1988 and 1993 . Each episode in this series was focused twenty years before the then current year ( in other words : 1968-73 ) .