Simplify the following text for a Grade 9 native English-speaking person.
Original: From 1978 to 1980 , he served as federal chairman of the SchÃ 1\/4 lerunion , a political high school student organization affiliated with the Christian Democrats .
Simplified: From 1978 to 1980 , he served as federal chairman of the SchÃ 1\/4 lerunion . This was a political high school student organization connected to the Christian Democrats .