Complex sentence: The exact date of the initial construction is not known, however, during the period between 1299 and 1301, a single-storey structure with cellars and a tower called the consistory was built.
Split into simpler sentences: The exact date of the initial construction is not known. However, during the period between 1299 and 1301, a single-storey structure with cellars and a tower called the consistory was built.