Complex sentence: Initially a'mini thermal bath complex' was constructed on the site, and then the foundation stone of Therme Erding was finally laid on the 10 November 1998, and it was officially opened on the 3 October 1999.
Split into simpler sentences: Initially a'mini thermal bath complex' was constructed on the site. The foundation stone of Therme Erding was laid finally on the 10 November 1998, and it was officially opened on the 3 October 1999.