Complex sentence: Dialect differentiation within Shilha, such as it is, has not been the subject of any targeted research, but several scholars have noted that all varieties of Shilha are mutually intelligible.
Split into simpler sentences: Dialect differentiation within Shilha, such as it is, has not been the subject of any targeted research. Nevertheless, it has been noted by several scholars that all varieties of Shilha are mutually intelligible.