Complex sentence: Square Norman keeps continued to be built after Orford, whilst Henry II was aware of fully circular castle designs before building the keep, and historians have therefore questioned to what extent the design can be seen as legitimately transitional.
Split into simpler sentences: Square Norman keeps continued to be built after Orford, whilst Henry II was aware of fully circular castle designs before building the keep. Historians have therefore questioned to what extent the design can be seen as legitimately transitional.