Complex sentence: Historical relations between Burma and Bangladesh include centuries of trade and migration between Bengal and the kingdoms of Burma.e After the British conquest of the region in the nineteenth century, colonial policies promoted the settlement of Bengali agricultural labor in Arakan.
Split into simpler sentences: Historical relations between Burma and Bangladesh include centuries of trade and migration between Bengal and the kingdoms of Burma. After British colonization of the region in the eighteenth and nineteenth centuries, colonial policies promoted the settlement of Bengali agricultural labor in Arakan.