Complex sentence: Historically the term is linked to the Advaita Vedanta-tradition, which states that there is no difference between Brahman and Ātman, but also to advaya, the nonduality of the absolute and the relative.
Split into simpler sentences: Historically the term is linked to the Advaita Vedanta-tradition, which states that there is no difference between Brahman and Ātman. The term also refers to advaya, the nonduality of the absolute and the relative.