Complex sentence: Notably, scribes began to upgrade some of the cursive scripts that has been thus formalized is known as a "bastard" script (whereas a bookhand that has had cursive elementas fused onto it is known as a hybrid script).
Split into simpler sentences: Notably, scribes began to upgrade some of the cursive scripts. A script that has been thus formalized is known as a "bastard" script (whereas a bookhand that has had cursive elementas fused onto it is known as a hybrid script).