Complex sentence: Though similar languages were used in the Vaishnavite contexts in Odisa and Bengal too, the one used in Assam was different, as it was based on Maithili (and not Brajbhasa), to which Assamese and a sprinkling of Western Hindi was added.
Split into simpler sentences: Though similar languages were used in the Vaishnavite contexts in Odisa and Bengal too, the one used in Assam was different, being directly related to Maithili (and not Brajbhasa). Brajabuli had Maithili as a basis, to which Assamese and a sprinkling of Western Hindi was added.