Complex sentence: Inside the castle there is a big library, which contains of 68.000 pieces, at least 10.000 pieces were printed before 1900, a collection of historical books as well printed materials from printers out of Herborn as Corvin.
Split into simpler sentences: Inside the castle there is a significant library of 68 000 works, at least 10 000 of which were printed before 1900. The library includes a collection of historical books as well printed materials from printers out of Herborn such as Corvin.