Complex sentence: The following forms were established as a result of the postwar character reforms-however, they were not completely created anew, but (like simplified Chinese) many were based on widely used handwritten abbreviations ("ryakuji",) from the prewar era.
Split into simpler sentences: The following forms were established as a result of the postwar character reforms. However, they were not completely created anew, as many were based on widely used handwritten abbreviations ("ryakuji",) from the prewar era.