Complex sentence: The grounding in reliable sources is quite scant here, although several papers are cited, it is not apparent that "non-Klinefelter XXY" is widely considered as a status for XXY persons.
Split into simpler sentences: The grounding in reliable sources is quite scant here. Although several papers are cited, it is not apparent that "non-Klinefelter XXY" is widely considered as a status for XXY persons.