Simplify the following text for a Grade 6 native English-speaking person.
Original: His first major job was the dramatic transformation of the fast Ã -- sterreichring to the much shorter A1-Ring in Austria , in the 1990s .
Simplified: His first large job was in Austria , in the 1990s . He made a major redesign of the fast Ã -- sterreichring , and created the much shorter A1-Ring .