Simplify the following text for a Grade 4 native English-speaking person.
Original: Helmut SchÃ n was the manager of the Saarland team from 1952 until Saarland became a part of West Germany in 1957 .
Simplified: Saar was the name of the Saarland after World War Two , when it was under French control . It became part of West Germany in 1957 .