Complex sentence: Prior to Thurgau's 1998 reorganisation, Wilen was known as Wilen bei Wil and was part of Rickenbach bei Wil, which was then broken up into the municipalities of Rickenbach and Wilen.
Split into simpler sentences: Prior to Thurgau's 1998 reorganisations, Wilen was known as Wilen bei Wil and a part of the Rickenbach bei Wil. This was then broken up into the municipalities of Rickenbach and Wilen.