Complex sentence: Some of the Hindu Brahmins also worked for Mahan Mugal Samrat Akbar (AD 1556) and so Akbar honored them as a Khan, just because of this they are using last name as Khan but they are still belongs to Hindu Brahmins.
Split into simpler sentences: Some of the Hindu Brahmins also worked for Mahan Mugal Samrat Akbar (AD 1556) and so Akbar honored them as a Khan. Because of this they are using the last name as Khan, but they still belong to Hindu Brahmins.