The phrase "differentiated into categories" is correct and can be used in written English.
It is typically used when talking about separating or classifying something into distinct groups or types. Example: The animals in the zoo were differentiated into categories based on their habitats, such as the African savannah, the rainforest, and the Arctic.
Usually in electoral analyses voters are differentiated into categories like "liberal", "conservative", "nationalist" and so on.
Studies were also differentiated into categories for health technology assessed: pharmacokinetic monitoring, supportive care, medical devices, diagnostic, drugs, screening, and surgery.
Li and Thompson (1981) uses classifier as a covering term to include measure words; while Tai (1994) stipulate that M contains two distinct categories: classifiers and measure words, and in A Reference Grammar of Chinese (Huang and Shi 2016), the classifier category name is retained but differentiated into two distinct categories: sortal classifiers and measure words (Ahrens and Huang 2016).
The category of emotion-regulation strategies was also further differentiated into the following sub-categories: cognitive strategies, either (a) reappraisal or (b) acceptance of the situation by adapting expectations (Sutton 2004); sharing feelings with others (Sutton et al. 2009); and establishing an emotional border ("don't put their monkey on my back").
Cell colonies could be characterized into differentiated or undifferentiated categories according to the morphology and AP activity.
Similar codes were grouped into categories to identify the main themes by framing differentiated concepts (categories).
The pre-defined category travel was further differentiated into travel related to work obligations or family issues, such as taking care of a relative or attending a funeral.
Cell lines were split into pluripotent and differentiated categories, and averaged.
Scientists who are studying Alzheimer's have differentiated three categories for research purposes.
Arrange observations into categories.
They were grouped into categories of function.
