Simplify the following text for a Grade 12 native English-speaking person.
Original: Saint Ursanne ( population approximately 1,000 ) is a city and a former municipality of the district of Porrentruy in the canton of Jura , Switzerland which has preserved its medieval character .
Simplified: Saint Ursanne ( population about 1,000 ) is a city and a municipality of the district of Porrentruy in the canton of Jura , Switzerland which has kept its medieval style .