Complex sentence: The British expedition plundered a large amount of treasure, manuscripts and many religious items such as tabots, some of which are in private collections and some of which one can view today in various museums and libraries in Europe.
Split into simpler sentences: The British expedition plundered a large amount of treasure, manuscripts and many religious items such as tabots. Some of these artifacts are in private collections and while some can be found in various museums and libraries in Europe.